You should also consider that my carrier, like those in most of the world, is charging about 10 bucks a megabyte for EDGE. My T-Mobile hotspot account runs, what...30 bucks a month with coverage in many places I happen to be? Oh, and WiFi is free at my house, and at my office, and near just about any apartment building in Spain since Telefonica started giving away those Zyxel wireless routers with security turned off (I can see three open networks from my living room, only two from my last apartment).
I guess you could put a Bluetooth AP in your house and office and use the Treo there...oh, wait, you can't because the Treo's Bluetooth implementation is so half-assed as to be useless. And that's on the good (aka GSM) one. The Sprint one is, well, quarter-assed I guess.
BenQ P50, please. RTFN.