I originally got a clear crystal case, which is awesome for protection, as the only things exposed are the keys, and openings for the primary and secondary cameras. The case creaks though, collects lint like a belly button, and once the cases screen starts to get scratched, it can make viewing the screen alot more difficult in sunlight.
I want to try a silicon case next, but I really do like the hard screen protector on the acrylic cases. I took my phone out last night and cleaned the case, and it's nice seeing that the phone is still in mint condition after almost a month of use. (Meaning no visible scratches)
And I don't think the UI is setup to work in landscape mode (aside from just using the screen as a viewer for the cam, pics, etc).