1) It weighs 3x's more than the BB.

2) Battery life: Had to have a charger in every quadrant; ie, one at my desk at work. One at home. One in my car. One to take with me when I am away from home. Battery life SUCKED.

3) As Rich mentioned, having to have to have 3rd party (GoodLink) for corporate e-mail. Unstable and unreliable.

4) Random reseting.

5) Personal email (versa mail) sucked balls.

6) Internet browsing was slow.

Reasons 1-4 are the most important to me. At my company, we have over 30 Treo users with the same complaints. I've had the 650 and 700, both were the same.

What I did like was the txt-messaging system. The touch-screen was a nice touch as well.

The Blackberry is by far the best PDA-type phone I've seen.