My bluetooth experiences:

1. SE T610 & Parrot CK3000: works 100% of the time. Hell, I even had in-car speakerphone calls with my phone buried deep in the drivers seat to the point where I couldn't find it.

2. SE T610, BT<->serial bridge, Zaurus: something's not quite right, they tend to forget to relink up sometimes. I suspect it's the firmware in the phone (fixable) or the bridge dongle (not fixable).

So, 50/50 so far.

-brendan