I wanted to follow up to this post --
Still dissatisfied with the customer service from Vonage. I bought my mom a year of Sunrocket service for her anniversary, with the ulterior motive of using her as a "guinea pig" to try out their network.
Their VOIP adapters ship out from Maryland, and I live in Virginia, so I received the adapter in 48 hours from the time I placed the order (their website advertises 7 to 10 days, so I was pleasantly surprised). The adapter is a Linksys SPA2102-R, and is about 1/3 the size of the adapter Vonage sent me two years ago.
It took longer to cold-start than the Vonage adapter does, but once it started, the service is working fine. The call quality from Blacksburg to Charlotte (not that the physical distance should matter much) is noticeably better than Vonage, but the account account "dashboard" is much worse -- in particular, the documentation and help is more canned and less useful, and some of the option screens are badly laid out.
Back in March when I was considering making the switch, Sunrocket had a promotional deal where if you purchase 12 months of service in advance, they'd supply you with a free cordless phone. The promotion has since changed to one I think is even more enticing: purchase 12 months of service in advance and get three more months. The first 15 months of service -- with taxes and shipping and the initial connection fee -- came to $244.06. That works out to $16.28 a month for the first 15 months, and still less than $18 a month after that.
If Mom continues not to have any problems with the service (we just hooked it up this week), I'll be switching my home service as well.