I have it on two computers. Because it was tedious to reply to the update questions each time it opened, I accidentally hit the wrong button one time and updated on one computer. I feel the sound quality is a little less, but I'm not quite sure. It's been too little time and too many variables to know for sure. Overall my experience has been positive. I seem to have a faster connection than most folks because I usually applaud a few seconds faster. As far as paying....don't know yet. I used it a lot during the winter months, but can't seem to come inside now that the weather is so nice.