I am new for this forum, But I used quite a few Clear Case with my iPhone 4 white.
1. PowerSupport Air Jacket (Clear) - I have two of them, they cracked on the corner of the case. First one broke off bottom left corner, Second one had fracture on top corner (as shown in first pic)
Good - Thin with enough protection, have small lip to protect touch screen, and surface is hardly scratch.
Bad - as I mention before and also it is expensive.
2. Incase Snap case (Clear) - I think I got the fake one coz it is so darn cheap on Amazon - Only case without any crack, but fitting is the main issue. Have a little scratch on the back surface.
Good - Thicker protection, small scratch fall behind Powersupport, Also have bigger lip to protect Touchscreen.
Bad - Issue about Fitting and a lot of OEM one fly around.
3. Incipio Feather (Clear) - I got it in the same time as Incase but I try Incase before I switched to Incipio - Crack on the top corner as well as PowerSupport (as shown in second photo)
Good - Cheap (I got mine around $15.-)
Bad - As I mention before and , easy scratch compare to Incase and Powersupport, and no lip to protect your front.
After a few round of clear case, I decide to go with Element Case Vapor pro white edition with front and back Anti-Glare Screen protector. Let see how it goes!!