I started as a sunrocket customer towards the middle/end of July. For about the first month, my experience was great. Everything worked out of the box, voice quality was great (much better than a cell), no real complaints.
Towards the end of August, I tried calling my sunrocket number and got a busy signal. It was strange, since I should have gone to voice mail. I check out the website, and there's a nice big announcement on the site about the outage. It lasted about 2 full days for me. They were very communicative about it, I knew what was going on, I knew why. I wasn't thrilled about this, but it was the first real problem, and I still had a cell if I needed the phone.
Mid to late September, I try to check my voice mail. Busy signal. There was apparently an outage. However, this time there was no communication about it. I tried going to the online support chat, everyone was busy. I tried calling support, but after 15 minutes on hold, I gave up. I emailed support. The next day everything was working again, but there was no response from sunrocket. There was no communication on the website, and support never even bothered to respond to my email.
Late September, the voice mail light kept flashing on the phones even when there was no voice mail. I got in touch with support, and they had me try a number of things to no avail. It took 3 weeks, but something eventually got fixed as it finally stopped flashing.
Last weekend, Mid-October, my internet connection went down. It was strange, however, as the phone continued to work, but none of the 3 computers on my network could access web pages. Network troubleshooting showed the problem area to be my cable modem. I started working with comcast tech support, but they kept saying my modem looked good from their end. After about 3-4 hours of trial and error, I tracked the problem down to my gizmo. For some reason, it would just fail after a few minutes and not allow any traffic through, except voice. I fixed this problem by moving my gizmo behind my router, whereas before it was in front of my router. I called sunrocket support, they had just done some upgrades recently. The rep on the phone asked me to fill out a QOS document, which had nothing to do with anything except voice quality, and email it back. I emailed it back 3 days ago and I've got no response yet.
My opinion is that sunrocket is a very low cost service, and when it works it works great. However, I've not had more than a single month without hitting some kind of problem with their service. I'm not jumping ship yet, since I love the idea of VOIP, however, I really can't recommend sunrocket if you're looking for reliable phone service.