I bought my IP4 the weekend of the launch, and I have really been satisfied with it for the most part. Granted, I was able to duplicate the death grip signal attenuation at will, but it seems like they are all affected by this. After I got a case for it, there was no further signal problems. I have, however, had lots of problems with the proximity sensor, which results in me hanging up on people at least once a day. It seems to be a common issue, but I have also read that many IP4s don't have the problem. I read stories of some people getting them replaced, and not having the problem on the new phone. I also read that some people had trouble getting Apple to replace the phone since it is a "software issue." So my hopes weren't too high when I contacted Apple about the issue, but I was pleasantly surprised. The support reps were extremely friendly, and offered to replace the phone immediately, no questions asked. Additionally, since I live in the middle of nowhere without an Apple Store within 120 miles, they offered to overnight it to me free of charge! I am optimistic that I will get a more recent build date phone, and hopefully not have any issues with the proximity sensor. If anyone has problems with their proximity sensor, just contact Apple and get it replaced without hassle!