They claim 50Mbps to 150Mbps data rates and latency from 20ms to 40ms. Initial testing has shown a bit lower than that, upload speeds have varied from 10Mbps to 30Mbps and download speeds from 15Mbps to 120Mbps, which for satellite-type connectivity is pretty amazing, particularly without the usual 500ms latency for those services.
If I were stuck in a rural area with some 3Mbps broadband download (even cities like San Francisco), I'd be all over this for $100 bucks a month and $500 for the dish array.
-mb