I've used OneSuite.com for 5 or 6 months now. At 2.9 cents a minute in/out-of-state toll calls, it's a great deal. No strings attached, no tricks, so far. I dropped my out-of-state carrier, also. We don't make many toll calls, but we're STILL saving about $20 per month (over Verizon local, AT&T out-of-state).
Found a small drawback to having no out-of-state carrier. I am not smart enough (or it can't be done?) to make an out of state FAX call, if it's not a 1-800 FAX number. I can't figure a way to get around having to dial the OneSuite.com 1-800-access, and then a Toll call to FAX.
Anyhow, i'm 100% happy with OneSuite.com 2.9 cent/minute service!
No monthly fee of any type, incidentally!