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I tried this case for my 3Gs and I didn't really like it either. There were watermarks on the back, it attracted dust worse than the actual phone, fingermarks showed up worse than the actual phone and it offers no protection!
 
All hard clear cases leave fingerprints (and scratch). All also watermark against most materials, especially the smooth glass back of the iPhone. There are some of the harder clear skins/protectors for the back that will eliminate most of the watermarking if applied to the phone under the clear case. I am surprised that this is such a surprise for most people. If you don't want fingerprints get a TPU case but even they still watermark but to a lesser extent.
 
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