Aplchian: I've used it briefly while road tripping around the country here. In Oz, it's pretty much the only way to get something faster than dialup if you're not in a capital city.
Speeds are essentially the same as ISDN, but ping time is terrible. Also, upload is pathetic, as you don't have nearly the signal strength that the satellite does. So for getting info and doing documents in the cloud, it's fine. For games, downloading, streaming or torrents, it's pathetic.
AMagz: Why not get a bandwidth monitor?
Narsticle: Don't you need to be near an enabled cellular tower / repeater station for that thing to work at all though?