While the iPhone 4 has a fairly scratch-resistant display, but worn at all times in your pocket, it will certainly not remain so immaculate. I chose based on the reviews and the look of this bag and I'm thrilled. The phone fits perfectly in the cover and can be due to the withdrawal tape also easily get out again. The material looks quite classy and robust despite the price. Small downer might be the velcro for the withdrawal tape. After about 14 days of use, I would imagine that he no longer keeps in frequent use for about a year. But that's just a guess and at this price no problem for me. Other users here wanted a magnetic closure (bad for cards with magnetic strips) or a pushbutton (bad since the close permanently pressure would be exerted on the display). The belt loop could be eliminated - I do not use and would imagine that it is difficult "friemeln" to a belt on.
All in all, in my opinion, an absolute buy recommendation - I'm thrilled!