
I purchased this mouse way back in 2006, and to this day there has not been a better small-size, asymmetrical-ergonomic, wireless mouse. Logitech has since discontinued it and now sells its successor, the Marathon mouse. It's very similar, however I don't think it tops the VX (but maybe a tie at most).
The VX just feels so comfortable (partly because I'm a small person in general with small hands) and the scroll wheel is fantastic. I hope my mouse never wears out before a true successor (from Logitech or another company) is released. Any other mouse currently released would be a downgrade.