I bought one last week and have been very impressed. So far, the phone seems fast and reliable, and after a few initial teething problems, I'm finally learning to use most of the features on the phone.
A few complaints:
1) Most of the handwriting recognition characters are the same as a Palm. However, Palm users will find that the Palm 'A' and 'T' aren't recognised, so there is some re-training required.
2) Outlook calendar syncronisation does not copy all-day events. There appears to be no work-around for this at present.
3) Outlook contacts with just a company name are translated as firstname, lastname and listed accordingly. Hence "Inside Flyer" becomes "Flyer, Inside" in the listings -- meaning I can't find anything I have listed under company-name only.
4) Poor microphone location means I'm constantly covering the mic with the palm of my hand as I speak on the phone -- so no one can hear me.
5) Daft ringtones. Why can't I just get a normal ringtone, instead of all this polyphonic, melodic nonsense?
Otherwise, I couldn't be more happy with the phone. It is a little brick-like, but it replaces two devices and is far smaller than most PDA's.