The case I am using is the UV clear one.  I have had no problems with the case coming off, and it fits on perfectly and does not block any ports on the phone, you can even put it on a dock, or your music dock without taking off the case.  I will start out with my cons of the case.  The case comes in a variety of colors and each one has a hole in the back so you can see the apple logo, the problem is it is very off center.  You can see the apple logo fine but, it bothers me every time I look at but I am somewhat of a perfectionist in some areas, plus this seems like such an easy fix or have your designers do some better measurements, also the camera hole is off center; it doesn’t block the camera at all but again it bothers me .  The clear case gets little air bubbles in some areas, the instructions stated they go away in a few days but so far I have had my case for a week and they are still there, they are not very noticeable though.  Each case comes with a small protector (like invisishield) for the apple logo.  With the clear one though it doesn’t really work, you can see the the logo and it looks ugly, plus because of the off centered hole it makes it look even more off centered when you put it on, I quickly took it off.  

Overall I like this case, it feels good and I always forget it’s on the phone.  I have never had any problems with the case coming off, and have not had anything get under the case to scratch the back.  This case is only for protecting from scratches, because it is so thin it will not really protect if you drop your phone.  If you drop your phone a lot I don’t recommend this case.  Over all I highly recommend this case if you care about looks and design, and if you are an apple fan you probably do because hey, thats part of the reason you buy Apple, because no PC or phone has ever looked as good as an Apple product.  If you want to see more go check out my video review on youtube.