WV700 Lens and anti glare are better than WV600. Same tubes I believe, have part numbers somewhere if you think I'm in error. Wouldn't be the first time.
WS550 also has anti-glare. (Maybe new type of anti glare, was able to clean hand print from son's friend, did not use liquid though, just soft cloth.) Same lens and tubes as 600 I believe. Some same, some new electronics vs the WV series. Kind of a new WV, without the glass screen. Uses plastic screen.