My BB 7250 from Telus (another CDMA carrier) did not pair well at all with my March '05 build X5 (w/ Bluetooth and Assist). Ended up getting a Moto v635 as a personal phone which works flawlessly with the X5, and using a quickkey on the BB 7250 (work phone) to forward it to my v635 when I'm in the X. Not ideal but actually works pretty good.

Not sure if Verizon has updated software available...but Telus usually provides it around the same time Verizon does and I've seen nothing to date...