I had Sagevone for around a year, and can't say much that is positive.I didn't have trouble with the uptime of the service but the call quality was constantly very , very, very poor, which made the service unusable. The voice quality itself was above average but parts of the conversation were lost, and this problem was constant and never solved.It was like dropping every other word, and it was just in one direction.
The people that I talked to could hear me just fine, but I couldn't understand their responses because of this problem of missing every other word of the conversation.
All VOIP tests run by them and me showed no problems with the connection over the Internet, with MOIP usually 4 or higher.
The technical support seems to revolve around one person, which may be the owner. All of my problems were blamed on my ISP by the support person.
After changing adapters, routers, cable modems, and switches several times, no problems were ever fixed.
Call quality was the poorest when talking to them.
They have a lot of features, a lot more than most, but if the service is always very poor, the features really don't matter.