My x50v is listed as "in transit", so chalk up another Mac user soon.
I had an iPaq 3950 for a few days (returned it) and tried mostly via VPC and Active Sync. Intially I swore, cussed, and tore my hair out, but then it started working.

Will have to use an OS X sync tool with the x50v b/c I want to sync with (and start using) iCal. Also hoping to sync tasks/file (but not sure what tasks correlate to on the Mac side?...)
A tad leary about having to use a Windows product, but hoping it'll be less frustrating than I fear (Apple still refuses to make a PDA, and the Linux Zaurus C3000 is too uncertain for me to risk right now).
Anyway, cautiously optimistic that I'll find this device really useful.
Should be able to contribute more in a week or so when it shows up.
Mike