I wish the FCC would regulate how ISPs advertise their speeds and force reliability disclosures. It's impossible to compare two ISPs without actually subscribing. I know Comcast can offer me 10x the advertised bandwidth, but I know in practice that can vary widely.
I use Google Webpass (a microwave radio link). The speed is 100Mbps, and the service is phenomenal. I've had one outage in 3 years, only lasting about 6 hours. I had switched to RCN for about a month, as they had advertised 300Mbps for a cheaper price. The speed in tests was about that high (and actually even higher), but I was getting a lot of buffering when streaming videos, that made the service much worse.