Feature:
On the plus-side, they come with good quality mounting systems. On the minus-side, you've gotta screw them in with the mics attached (except for the condensers) as they're part of the microphone casing. I can see this being an annoyance in applications where you're borrowing somebody else's equipment, but if you just leave them attached to mic stands/clips, you shouldn't have any problems at all!

Quality:
I don't own the mics, so I can't say anything about the long-term quality, but for what I used them for, they worked out just fine. They seemed of good fit & finish.

Value:
For less than half the price of some of the more ridiculous single microphones, this kit is perfect for small project studio/garage/practice space recordings. There are better mics out there for sure, but for the price this kit is one of the best, most cost-effective ways to get some decent drums recorded.

Desirability:
It's pretty sweet to be able to take a small, nice-looking case and a couple of booms/clips/cables and go record somewhere :)

Sound:
While they're no professional mics, this kit makes it easy to get a decent-sounding recording for a decent price. Great for slightly advanced demo recordings, but you'll probably want to get some nicer mics for a full-length recording, especially if you're playing more aggressive music styles (I recorded for a metal band). Overall, pretty decent.

Ease of Use:
Pretty damned simple. Hook 'em up, mess with the placement a little bit, and start recording. Sort of "set and forget" :)

Support:
Didn't use it, didn't need it!

Overall:
As I said, I don't own the set, I just borrowed it, so I can't say anything in the long-term, but they got the job done quickly, painlessly, and efficiently, with a decent sound. Can't say much more than that!