I can't speak of the Seidio case specifically, but I'm not a fan of the rubberized cases. Nor am I a fan of the Seidio crystal case. While it's nice they protect your phone, they get lint/junk from your pocket underneath the case.
I highly recommend
www.bestskinsever.com. 6 bucks and you get a clear protective skin that adds no bulk whatsoever. But then again I'm very careful with my phone.