I haven't had any issues with my HTC One since buying it about a year ago. Radio and WiFi signal work great, and although some people report issues with battery life, my HTC One's battery lasts the longest of any smartphone I've ever owned. As such, I'd definitely recommend you checkout an HTC One (maybe the new version coming out later this month?)
Nope great signal. Never a dropped call for me. Also I have LTE where I live. I would say that this phones biggest shortcoming is the call voice quality. Its not terrible it just isn't HD voice. Other than that this is my best android to date no doubt.