i even know a 4.0 guy that plays only slices. but he hits the slice fairly hard but still not enough to hit clean winners. he can hit passing shots with slices too and can run all day long.
Only bad thing with this is that he cheats. He often cheats on the service calls. he will call Aces and close serves that he can't return OUT. I guess that is only way he can win matches but it is pretty bush league.
Babolat Pure drive 2012, 55 lbs, Kirschbaum Proline X / X-1 biphase. Nalbandian backhand and Nadal forehand.