A guy I work with has an Evo in a silicone case, and that is fine with the kickstand. The lean angle is slightly different as the phone is a bit higher off the surface due to the case, but that is it.
I love the Innocase for those that are asking about them. The one I received the other day for the Thunderbolt will be my third. It is slim, offers some protection from drops, and does not get caught up in a pocket if that is how you carry it.