I'm having serious call quality issues, and am on my second TITAN. I also see some data issues, but not nearly as frequent. The phone issues are hppeining almost every time. It's a known issue from HTC, so don't feel like going through this any longer.
Other than that, it's a great phone. But, my clients need to be able to reach me on my cell, and be able to hear me as well. I'm just trying to fugure out how many times before ATT switches my phone to another device. I wouldn't mine switching to the Titan II or the Lumia 900, but nothing else satisfies at the moment.