I upgraded to Rogers from TIM and so far I haven't had any of the problems I had with TIM.
With TIM, I was experiencing problems with the keys 'sticking' when dialing certain combinations, speaker/mic/calling issues, and Yahoo!Go stopped working. No problems so far this time.
The OS is still really snappy, desktop view on browser, etc. Navigating pictures on the media card is still a little sluggish... but I can deal with that.