Overall there's not much to say other than that the service itself has been good. No Vonage-related technical problems to report so cannot comment on tech support or lack thereof. My present ISP (Comcast) is another story; when that connection becomes unreliable or unstable so too does Vonage which naturally makes sense.
We're on Vonage's 300 minute plan for $11.99/mo which is sufficient for our needs. Problem is these ridiculous add-on charges such as "intellectual property fee" and other nickle-and-dime fees keep increasing! We now pay about $19/mo total. I thought about going back to landline under a bundled service but the math is marginal and not worth the effort right now.
We really like the voicemail to email transcription service. That's the "killer feature" that keeps us onboard with Vonage. Nice to literally read the message. And amazingly its pretty accurate in the 90% range in getting the transcriptions correct enough to understand.
Porting our home number number into Vonage wasnt exactly a cake walk since at the time that number was tied to a DSL line. Fortunately Vonage did help out with that process and it eventually worked out fine even though it ended up disrupting DSL. That's not Vonage's fault but rather an order processing and process timing failure with CenturyLink.