Sprint sent both units to us for review - I got to play with the Treo 650 and PPC-6601 for roughly 3 days before sending them out to my reviewers to review. I honestly would not give my SMT 5600 up for the PPC-6601. I got tired of it after about 6 hours of lugging it around.
Now for the Treo 650 - I may flirt with the idea of trading up from the SMT 5600 but not just yet. I've gotta see if the MPx is any better
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We ran a whole series of reviews of the Treo 650 and PPC-6601 on X-Gadget. If you want to read more here are the links:
http://www.x-gadget.com/articles/54/...reo-650-review
http://www.x-gadget.com/articles/73/...rtphone-review
http://www.x-gadget.com/articles/44/...nt-PCS-Network
Vincent