It is what I am using right now, and I have been for almost a year now. I love their plans, for great affordable prices. Their support is also good, IMO.
The topic LK mentioned is full of horror stories. O_o I really think they have improved since that topic though, cause the service is awesome. Also, a year ago, their website and services weren't as good, so keep that in mind. I imagine they have greatly improved.
~Jon