This is more of a comment on the service that is VT Pro than the app itself.

Last year I bought this service and it was good for 5 computers. I bought another license this year through .Mac and didn't notice that the new version is only good for 3 computers.

The 3 computer version costs $49.99. There's a 10 computer package for $79.99, so I asked how much it would cost to upgrade. You'd think $30 right? How about $64 to upgrade. I sent a note to the VT folks three days ago complaining about this - still haven't heard back from them.