Pretty much what raider said. However, the first generation Haus machines did not have a timing mechanism which would for a second, delay one of the wheels so the ball would change direction. You could buy a kit to make that happen on the first generation machines which we had. The second generation machines had the timing mechanism already installed, as well as "protecting" the motors from "ball residue." Easier to clean, less mess.
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Who needs a 300 or 800, when I have a 294 and a 295!?!?!