I got the HTC Sensation 4G phone when I got T-Mobile service. I had no complaints about the Android operating system (this was not my first Android phone), HOWEVER there were two flaws with this phone that I found.
1. If I would hold the phone the wireless internet would drop completely (aka death grip).
2. The call quality when someone would talk was not good at all, it sounded high on treble and the speakerphone sounded worse.
Needless to say I brought the phone back… could not justify getting a phone for $249.99 with those two problems.