+1 with cindy.
i don't see any 3.5 guys s&v more than a few times a match. it's definitely not their bread and butter play -- more of something they mix up here and there. volleys have to be really solid and they have to be able to dig out tough half volleys.
i do think that chip and charge on returns is a very effective and relatively easy strategy that should work at 3.5 though. chip the ball short or deep cross court and move in. puts pressure on the opponent to hit a good passing shot or lob with two guys at net.