I got a new cell phone this week: the Palm Treo 680.
This is a quad-band GSM phone (for Rogers Wireless or Fido. It also supports EDGE data speeds, which are quite a bit faster than GPRS. It's actually pretty zippy.
Initial impressions: I really like this phone. I still like PalmOS, but this phone has a much nicer screen than my Sony Clie PEG-TJ37, even though the screen is smaller. The quality of the phone is quite good. It has good-sounding audio (although slightly more obviously digital than my prior Motorola RAZR V3. I haven't given it a hard test under poor cellular conditions yet, but so far, so good.
My brother-in-law and a friend of mine both have the CDMA version of the Treo 650 and they both think that although it's a great PDA, it's a marginal phone. Steve Punter's review of the Treo 700wx seems to match their experience perfectly. However, the people I know with GSM Treos seem to be very happy with them. This might be a strong indicator that if you like Palm smartphones, you might prefer to use a GSM provider like Rogers, Fido, Cingular Wireless or T-Mobile USA rather than a CDMA provider. Of course, if you live outside Canada and the US, you are almost certainly going to be using GSM so the point is moot.
I'll report more later once I have more to say. So far, after 24 hours, I'm very happy with the phone.