I really like my low-profile Keychron. I have the v3, which had completely flat caps, but have upgraded to their new caps with the slight cup and really like it. Just brought it to the office and love using it for work. More on reddit.com

The Keychron K3 is a particularly well-designed slimline mechanical keyboard, but its chief competition is other keyboards from the same manufacturer. More on forums.appleinsider.com

If you want the keys to be exceedingly responsive then go with the K3 V2 with Keychron Low-Profile Optical switches. You barely have to touch a key for it to register. This can be problematic for those who rest their fingers somewhat heavily on the keys when not typing or for those used to normal profile keyboards. If phantom keystrokes are a worry for you then the Gateron Low-Profile Mechanical switches require a little more force and travel to register. You can change switches at your convenience should you purchase the Hot-Swappable version of either keyboard. The keycaps are also made of different materials. The K3 V2 keycaps are made of ABS which are cheaper and therefore wear more easily over time. They also allow more light through from the backlight resulting in more legible symbols and vibrant colors. The K3 Max has keycaps made of PBT which cost more to manufacture and are more durable. However they have a more bland, dull and matte finish while also not allowing as much light through resulting in softer tones. I work in low light and prefer the backlight to shine through and enjoy the colors. I also have yet to notice any degradation or shine on the keycaps in normal lighting but it’s only been in use for less than a year. If the backlight is white or otherwise not as important and you work under normal lighting then you may prefer the PBT keycaps of the K3 Max. Of course you can always change the keycaps for those of your choosing just as long as you realize that those choices are much more limited. This will likely remain the case given the popularity of normal profile keyboards and the Keychron specific stabilizers on the larger keys (aka Space Bar, Left Shift, Backspace and Enter / Return). The K3 Max also has QMK / VIA support should you want access to macros and shortcuts but at the expense of losing optical switch compatibility. If you plan on mainly using the keyboard for working in normal light, aren’t excited about the backlight, or don’t plan on gaming as much then the K3 Max might be preferable. I tend to work in low light and game occasionally so the backlight colors and key responsiveness convinced me to stick with the K3 V2…. for now. Hope this helps. More on reddit.com

I personally think hot swappable is v important as it increases the longevity of the keyboard (what if you have a broken switch?) and also adds a flair of customisation for keycaps, especially as the legends get worn. I don’t think 2.4ghz is worth it. The Bluetooth is pretty good and also doesn’t use a USB slot More on reddit.com