This is a review for the M27Q, not the entire list of monitors on the Amazon product page.On paper, the Gigabyte M27Q rivals the top 1440p 27" gaming monitors while being about $100 less in MSRP. I previously owned one of these high end monitors, the Dell S2721DGF, which I had to return because it was defective. For $120 less, I replaced it with the M27Q, which I've been using daily for about a week now. Though I wasn't able to compare the two monitors side by side, or even within the same week, the M27Q rivals, or even surpasses, the S2721DGF in picture quality in my eyes. I'm not the most discerning viewer, but I can tell the difference between IPS and VA with normal usage, and can barely stand VA panels for gaming. I could not notice any delay or inverse ghosting playing esports titles on the M27Q in its default overdrive mode. According to measurements performed by the top tech review publications, the M27Q has a longer response time than that of the class leading S2721DGF, but I could not tell the difference. As for color, I kept both monitors at the default color settings out of the box - the Dell had great saturation, possibly oversaturated. The M27Q appears less saturated, and its overall color out of the box appears more neutral, while the Dell appeared warm. Regardless of which you prefer, both monitors' color can be adjusted. However, no amount of calibration can fix the Dell's low contrast ability; the M27Q wipes the floor with the S2721DGF in this respect. Perhaps the Dell's biggest flaw is that it can't properly display black, while the M27Q has among the best contrast in its category.That the M27Q has a display that rivals more expensive monitors is not its only selling point. Its KVM switch is something that would cost over $100 separately - and it's almost nonexistent in other gaming monitors. The feature is life-changing and I feel like I can't go back to a monitor without it. Before this, I needed to use a bluetooth membrane keyboard with multi-device support, and two separate mice. Now, I can use my preferred gaming keyboard and just a single mouse connected to the monitor with no hassle. My MacBook Pro outputs its video and pairs with the mouse and keyboard with a single USB-C connection to my monitor (USB type C input is another distinctive feature for a gaming monitor). Switching between my MacBook Pro and my desktop PC connected via DisplayPort works seamlessly almost all of the time. Occasionally, switching to a sleeping device doesn't wake it soon enough for the monitor to detect input - but I place part of the blame on the computer in that case.While the KVM switch is a huge quality of life feature, there are some frustrating quality control issues which lowered my rating. The most common complaint I've noticed with this monitor online is IPS glow, which is light bleed from the corners of the panel. My unit definitely has the worst IPS glow in any monitor I've bought. However, I would say it does not bother me, since it only becomes apparent while watching movies in the dark. Gaming, browsing, and regular usage in dark mode - even in a dark room - hides the IPS glow. The problem is not noticeable at all in a normally lit room.Though the IPS glow doesn't bother me, there's an overall noticeably lower level of polish with the M27Q that the Dell didn't have. Of course, I returned my S2721DGF because it did not properly work and had firmware issues, but I felt like there was just one thing wrong with my Dell. The M27Q in contrast has a number of problems that indicate lower standards for quality control. For example, I noticed my monitor was not level with my desk, with the right edge of the display being about a half inch higher than the left. It bothered me to the point that I could not use my monitor until I fixed it. The cause of the problem wasn't immediately obvious to me, because I expect a brand new monitor, on a stand which doesn't support rotating, to be perfectly straight. Instead, it turns out that the mounting plate on the back of the monitor has a large tolerance for positioning the screws. I've attached photos of the plate before and after I fixed the problem. The plate appeared to be on straight initially, though the screws were obviously not all centered inside their respective holes in the mounting plate. The noticeably large wiggle room in the mounting plate gave me the idea to try to correct the slant of the monitor by screwing the plate in so that it was crooked relative to the display. This means that the arm might NOT be sticking out of the base at 90 degrees, or that the holes are not aligned properly. Poor, poor quality that could have been much more frustrating if the large tolerance in the backplate was not clearly visible. The screen is now acceptably level with the desk, but having misaligned parts does not give me a lot of confidence in the product.Additionally, I've noticed some strange firmware problems that lead me to believe that Gigabyte knowingly shipped the firmware with some features not properly working. The first thing I noticed was that when the monitor is in HDR mode, the brightness level resets back to 100% when it wakes, even if it was previously lowered. This strangely doesn't seem to happen when the monitor is not in HDR mode. There's also an "auto off" setting, which as far as I know, is supposed to turn the monitor off after some time asleep. The setting hasn't worked for me yet, which means that the power indicator is always blinking when I'm not using it. It can get annoying when the room is dark, and the only way to stop the LED from blinking is to physically turn the monitor off by holding the OSD joystick button.Aside from the firmware, I have noticed some physical defects in the panel itself. On my unit, there's either a speck of dust or a scratch on the screen, but luckily it's on the black border. The M27Q has extremely thin bezel edges on the top and sides, but has a black gap between the display's image and the bezel on those edges. It's not uncommon in monitors, but looks less consistent, and to me, less pleasing than a display that reaches the edges of the screen. In this case though, I'm lucky that the defect was on the gap. There was also one stuck pixel on my unit which only rarely appears. It's not noticeable in normal dead pixel tests, but it becomes visible as a bright red dot when the lower part of the image is dark and the upper part is bright. More specifically, it depends on the other pixels in its column. Moving a window just one pixel over can hide it immediately, and I've attached photos of it being visible and hidden based on the position of one of the windows on the screen. I'm disappointed that I have a stuck pixel because I've managed to never own a computer monitor with dead or stuck pixels until now. Because it rarely shows up, I'm avoiding trying to exchange my unit (for now). One thing that bothers me is that occasionally I've also noticed a brief flickering horizontal white line when switching to my MacBook Pro input. Like I said, the small issues with this monitor don't give me a lot of confidence in it, so I can only hope the white line problem doesn't degrade into constant white lines across the screen.Obviously, since the monitor is much more affordable than other products with the same features, Gigabyte had to cut corners somewhere. The plastic on the monitor is obviously less solid than that of the Dell, and the base is much lighter. Subjectively, its design looks uninspired while the Dell has a distinct design and a mix of subtle and aggressive curves and angles. The M27Q doesn't feel flimsy by any means, so I can live with it looking and feeling a little cheaper for over $100 less. However, its defects and strange behavior are something that shouldn't need to exist at any price range. For $300, my display should stand straight and the monitor should turn off when it's supposed to. Additionally, stuck or dead pixels should not be common. Still, I've learned to live with the problems on my M27Q and will keep mine, but the various issues kept this from being a five star purchase. I would recommend the M27Q for a 1440p gaming and productivity monitor, but be prepared to live with some minor quality issues. Lastly, in case you are wondering about the BGR subpixel rendering - it has been no problem to me and I couldn't notice it even up close to the monitor.Edit: I accidentally listed this as three stars, when it should have been four.