The KC60 after 7 months of ownership:
I received this board, and appear to have one of the few that are in great working condition. I looked through the reviews below and don't seem to have any of the issues mentioned below, the costar stabs seem to work fine, the backspace key is printed correctly, I really love this board. I got the black version with Gateron Browns, no case upgrade.
I've reprogrammed this board using the QMK firmware, and would highly recommend anyone else do the same. I got it as my first 60% and then bought a pok3r a week after the drop ended and actually forgot about the board. I received the keeb a few days after my pok3r pcb took a dump on me, and it has been working rock solid ever since. There's nothing special about the LEDs at all. They work just like GH60 Satan pcb LEDs would work, I assume. No special LED for caps lock or win lock or anything like that. The switch for the spacebar is inverted so that the LED is on the bottom. If I'm sitting back in my chair, the super bright LED is shining in my eyes. I usually turn off backlighting. If I ever take the keeb out of the case I'll be desoldering that LED for sure, as I don't think it really adds much.
The PBT caps are great, they aren't super thick so the keyboard is a little 'tinny' sounding compared to my pok3r, but it was also half the price. They've got a great texture to them, though I am having some rub-off on the S and D keys. The corners are ridiculously sharp for some reason, but if that bothered you I suppose you could hit each edge with a file and they'd be perfect. I've certainly gotten worse caps, and the lettering looks better than the pad printed caps on my pok3r. Mine came with a Windows 8-esque logo, if that makes a difference to you.
It's plastic. This is about my only gripe with the case. I don't know what material it is, though I'd assume they would go with ABS for durability (it's more shatter / crack resistant than PBT, AFAIK). The lip of the case is about .5mm below the bottom of the keycaps and 3-4mm above the plate. Doesn't look as clean as the pok3r, but that leads me to talking about the plate...
The plate is unfinished aluminum. It's fairly ugly. If I had assembled this keyboard, I probably would've painted over it. It looks a lot like the planck plate on the OLKB store, but it's a tad more 'grainy'. It reflects the light well, but since the caps aren't shine through, it doesn't end up making a huge difference. Something that completely makes up for all this though is that the plate supports switch-top removal. A production keyboard with a plate that supports switch top removal?! I didn't see this on the page or in the comments (admittedly I didn't search too much for it).
Overall, I really enjoy the board. The price point is great, the PCB is fully programmable, plate supports switch-top removal, PBT keycaps.