close to 1year and didnt had any problems except once i forgot my unlock pattern and tried wrong patterns many time till my phone got auto locked.
All my internet connectivity was off and to unlock it, the phone asked me to input my google account information. Had to reset it from boot settings -_-.
Rooting is not working after the latest update patch.
Just looking forward to the Jelly Bean update for x900.
Overall its a great phone, with a really powerfull intel processor that is capable of doing some pretty good raw processing work.