I recently purchased a Palm Treo 750 to use for my business and personal stuff. I need a calendaring program, a good contacts list, and something that is relatively easy to use. However, I have been having some "issues" with the Treo, including the fact that it cannot hold a charge for an entire workday if I use the web features at all, it cannot sync to my Mac, and I have yet to be able to send an e-mail and have it work. I have 30 days to exchange it for a different phone if I don't love it, but I can only exchange it once. So my question to all of you smart phone users is this: which do you recommend, the Treo or the BlackBerry and WHY? Please feel free to share your personal experiences with either and what you love or hate about it. Thanks!