Using the Switcheasy NUDE, with no problems.
I am using one now. No scratches on the phone but I did have to modify the volume buttons.
I use a CaseMate Vibe case that I had personalized and purchased from Swanky Press. It has a thin silicone buffer that sits between the plastic and your phone to add a layer of protection.
See:
http://www.swankypress.com/content/chalkboard-monogrammed-cell-phone-case
Yeah they could improve the buttons. I pushed mine out with my finger a little.