We have had it for over 2 years now and about 98% of the time we are happy. The other 2% is issues with vonages system, our internet provider, or a power outage.
We have 6 lines through them, 5 phone and 1 fax (plus one 800#).
We have no sound issues, but then again we have pretty fast/large connection.
We have saved $1000's over the years...
The support can be bad, but you just have to request to speak to someone else and then you should be fine (the 1st person is usually the call center they have thats not in the US).
