I recently purchased a CoolerMaster QuickFire TK with red switches and am very happy with the purchase. Always liked small keyboards, particularly as I use a keyboard tray, but having a number pad is so very nice, so this is best of both worlds. Backlighting's great too - I have to say that it could be a bit less bright, even on the lowest setting, but it's still not too bad as some keyboards I've seen (Razor, I'm looking at you). It takes a bit of getting used to it as the inside of the keyboard is red as well, which increased the red glow when the keyboard's lit up, but it's pretty nice and obviously handy once you do. I think the Logitech Illuminated keyboard at low has probably the best backlighting I've ever seen, very subtle, so that it doesn't look like backlighting as much as letters that you can see in the dark.
As for the keys themselves, coming from a Filco Majestouch cherry-brown keyboard, I really like them and it didn't really take too long to get used to it. Even though the browns have fairly subtle feedback, you'll notice the difference immediately. They require less pressure to activate than the browns, but the difference isn't vast, as browns already have fairly low resistance. For me, for light typing and gaming, reds are really nice just because of how little force you have to use - I actually find it pretty easy after only a few days not to bottom out with any noise just when typing normally, which together with the lack of a tactile bump, makes them a bit quieter than the browns overall. Being used to a brown's bump may have helped in this respect as well. You'll probably find yourself making more typos until you get used to just how easy it is to press the keys in. The stabilizers for the larger keys such as the spacebar aren't quite up to the level of the Filco, as they have a definite clickyness to them while Filco's feel practically like any other key. But either I've gotten used to them or they've mellowed out a bit after some use, as I don't really notice them much anymore.
There are a couple of things that are kind of annoying about this though. One is the fact that the Enter key on the number pad is de-activated when numlock is off. I personally keep it off as my default state as I use home, end, page up and down, delete, and the arrow keys quite a bit more often. It's easy to hit the numlock button and type away on the number pad quickly as well as know exactly where the keys like insert, home, etc. are once you've had some time to acclimate to it though, so the merging of the two groups of buttons is IMO a good idea.
Another is that the Fn key for turning the F1-12 keys into their alternate shortcuts, while able to be held shortly to access the shortcuts and released to keep the F keys active, is unable to do the same when it's in locked mode (enabled by holding it down about two seconds.) What I mean is that when it's locked so that the F keys perform their alternate actions by default, you can't then hold it down and press an F key to use the F key's original function, like say, maximize a browser screen with F11. You have to hold the Fn key down the two seconds to un-lock it, and THEN press the F key. As I find it most useful to keep the Fn key locked to use the media controls, this is definitely an annoyance, and probably the worst thing about the keyboard.
While I've only had this for a few days and thus can't really comment on the long-term build-quality / life, I'm very happy with this keyboard and would definitely recommend it to others who are looking for a mechanical keyboard that's smaller than a full size and doesn't sacrifice anything like backlighting or a number pad. I have to say that out of the four mechanical keyboards I've tried (blue, brown, black, and red), this is my favourite for general use - low and even pressure is easy on the fingers and just neutral overall, no apparent mushiness like some people may think of the browns as, and less noise overall.
