Ditto the Vertex. I got the 1/3 hp single speed unit, but even with that, the quality is there, and I haven't personally needed the higher speed. Of course, I don't polish a lot, but I've seen no issues. Slight wobble maybe depending on ball placement, but solid unit. Thoroughly pleased I chose that brand after reading comments on this board.
--------------------
Signature? I don't need no stinking signature...