I went into the training mode trying to figure out how to switch to my favorite-looking guy the wizard, but couldn't. Why? Because running around and hitting back the balls is damn addictive. The sound effects are great, really like how the hit sound of the characters are different, and have at least two so you don't have to listen to the same clang. That alone made me try all of them.
The power of the shift key might be too much for me. Probably by design? It feels like by pressing it I run over the point while without it I do not reach forcing me to aim it carefully. Especially on the slow to activate wizard.