Originally Posted by Nomadz

I'm a UK customer who's been trialling a SIM corporate account. I like them very much and they have brought down my data roaming charges significantly when travelling throughout the US.

Here's a long and in-depth review of their service.

It sounds like they don't provide as good a service to their individuals as to their corporate accounts, so you might want to factor that into your decision. Still, they go a long way to bringing the cost of roaming down and that should make up for it.