The only VoIP I have experience with is Skype, but to a limited extent. And there was that one time I talked with a friend in Scotland with MSN. Both weren't that good for me, but it's due to my connection. I am connected on a 56k dial up line that loves to irritate me and run at 20k or less (ATM it's doing about 14k and that has been it's top speed for the last week).

Then there's that whole thing of me being shy, even though a friend in Brighton says I have a sexy voice.