I've had the Globalsat BT-359W for over a year now and have never had any problems with it. I've used it with a Treo 700wx and with my Q. I've used it with iGuidance, TomTom, WLS, and GoogleMaps.
Here's a link:
http://www.buygpsnow.com/globalsat-b...t-gps-615.aspx