Realize I'm a bit late to the thread, but I'll offer performance comments generally similar to those here. My outbound call quality and performance are good and consistent. Inbound call quality is a different matter. I am forwarding from GV, and experiencing fairly substantial inbound latency that I realize likely cannot be overcome short of porting my number from GV, and I"m not yet prepared to do that.
Have also noted that the G711U codec is the default on the outbound test calls I've made.
Presently, the Vestalink website is down, so that never leaves a customer with a warm-fuzzy
Can't check account status, minutes used, etc.
Vestalink users should be aware that they do have a Twitter "status" account, @VestaLinkStatus. It isn't used often, but they tweeted an "All systems normal" message about 12 hours ago, so I have to assume the website being down is a new issue.