I've too have the USB version. WUHU is a great program, but I perfer Cumulus. Like WUHU it's free and totally compatible with the Vantage Pro2. And has uploads for Wunderground, CWOP, PWS Weather, WeatherBug, and I think AWEKAS. I've got both WUHU and Cumulus on my computer and I like Cumulus alot better.