I have been using a T-Mobile Blackberry 7100t for about 2 years now. Its been a good phone but there are some things it is missing that I would like to have in a mobile phone, especially with my new job. I just picked up the new Verizon XV6700 and I have to say I am impressed. I have managed to hack it up pretty good so far and in addition gotten it to do Active Sync with our Exchange over wireless with no problems. E-mail sometimes shows up on the phone quicker then in my Outlook client.
I will play with it some more prior to passing final judgement. The only thing I have noticed is the battery life is not as good as the Blackberry (which easily lasted all day and therefore I never had a car charger for it). I think a car charger will be needed for this phone for sure!