I don't use one. Had the phone for two months now. Still like the first day.
Sent from my SCH-I500 using DroidForums App
I see at least one thread a day with someone "belly-aching" about scratches on their phone. IMO my phone is too valuable to leave anything to chance so I use a case as well as a screen protector. A quality screen protector will not affect your phone's usability and will be practically unnoticeable.
(from Beka's DX)