Stayed with "Sunrocket" (aka Teleblend). My credit card charge comes as "Sunrocket/Teleblend".
Same equipment and no number porting. It seems they are using the same equipment as SR and I am getting the same quality. Paying about ~$15 monthly, with taxes.
I wasn't a SunRocket user, but I use ViaTalk and I think they're great. They frequently run a BOGO deal where you pay about $200 and get 2 years of service.
One thing that I think would appeal to SunRocket users is that ViaTalk is owned by a company that runs on a debt-free model, so the likelyhood of bankruptcy (a la SunRocket) is pretty slim for the time-being.
I switched from Sunrocket to ATT Call Vantage. ATT Call Vantage is nearly flawless service. I'm very happy with it. They bill my card about $29 a month. I got a free telephone adapter and free first month service when I signed up. I ported my number over, took about 10 days.