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There is no voice lag in GV that I've noticed, I think it works more like call-forwarding than voip.

I'd love to find some rigorous way to measure it, but (as of six months or so ago) when I sat with two phones, held down a button, and waited for a tone to come out the other end, the delay was observably longer with a GV-to-GV call than with a GV-to-cell call, which took longer than cell-to-cell.

I find myself saying "no, go ahead" or talking over the other person far more often with GV than not. It's certainly usable, but I avoid GV if the call quality really matters.

It definitely takes longer for calls to connect and I think it may drop calls more frequently when using it on a cell (although it has improved greatly in that regard from about a year ago). I recently started using it through gmail and have been told the calls sound much better. Not sure what it all means.

In fact there is no VoIP component to Google Voice, except perhaps at the carrier level.

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