My friend got it for his laptop, and it seems to work pretty well. It's not as fast as 128kbps, but he's still trying to diagnose why. Usually he connects anywhere from 30-80 kbps, so it's like a 56k modem on most days. For what it's worth, he's also using it under Redhat 6.2 on his laptop. Reception is decent (in Philadelphia suburbs).
He is paying something like $800 for the year, so it's a bit steep...