I have the black OEM skin - Love it but never use it.
I find I'm using the OEM leather pouch that came with my 8320 all the time, as it protects the device when its in my pocket and locks the keypad automatically.
I do want something for when its out of the pouch, but even the OEM skin is to thick to really fit the assembly into the leather pouch!
I think they're tactful. For instance, I am a part of some groups that get custom skins to utilize when promoting the initiatives we believe in. It is tasteful and gives us a sense of uniformity.