I have the Sprint case described by the OP, and I'm mostly happy with it. I'd rate it a 4 out of 5.
A couple of nitpicky items:
You have to be careful to align the phone correctly when sliding it into the holster. If you go in at a slight angle, the corner of the holster will wedge itself between the front bezel and the case, and it's a pain to get it back out w/out breaking stuff.
The little tabs that hold the case on are thin and fragile, and can easily break off when you remove the case. I've had to replace my case twice because one or more tabs broke off the front piece.
The case does make the keyboard harder to slide out, but I like the firmer action, so that's not a problem. YMMV.
Sent from my toilet.