SunRocket is not too bad. The phone is proprietary. I have SunRocket and RingCentral. I'd vote for RingCentral because in the end voip is voip. It is will be more about the services and the features. And RingCentral has alot more services to offer (800, PBX, faxing, etc.)
umm didn't sunrocket close its doors last year?
Who is the best? Vonage?
Need to have GREAT broadband though. I have unlimited down (tested at 23Mbits/sec down) and 10 megabits up, so my phone is always crisp.
Vonage uses very little of that connection, about 90k for their highest quality if I remember correctly. I had a VOIP account working great on a crappy 512k dsl connection in the Philippines.
I had Vonage for about 8 months. IMO they're a POS company. They will fuck you when they can and their support is shit. Read their TOS before you sign up. Mind the cancellation fees and whatnot.
I switched to SunRocket for few months after I got rid of Vonage but they ran out of money and folded.
Ever since then I've been with a small company called VoicePulse. It's around $27 but their support is night and day compared with Vonage and SunRocket.
I heard great things about MajicJack. I'll probably order it whenever I get around to it.