I bought both the silicone and carbon fiber cases - have been using the silicone one - the two-piece is just too bulky, so I think I will return it and get the holster.
For those wondering, using either the VZW car or home dock requires you to remove any of the VZW cases. That said, the silicone case is a very easy on/easy off case, so I haven't been bothered with taking it off for either dock.
Personally, I like the silicone case - it doesn't really add much to the size of the phone and, like a previous poster, doesn't snag in your pocket.
Hope that helps some...