I own the 8703e from verizon and love it! i have yet to pay any money for software, including chat clients(aim, msn, yahoo, GOOGLE TALK, bb messenger). Opera Mini for free is also a big plus, where as everyone else has to pay 30 bucks.
Here are my gripes about the BB that the treo700p supports, we dont have an external memory card. We don't have the ability to play video clips and we can't send attachments through email.
I personally dont care very much for the video player capabilities but sending attachments was a big thing for me. I have managed to get around this by using del.ic.i.ous, but I am definitely looking forward to a fix for this.