Hi,
The bigger AT406 only came in a ball bearing version and was standard equipment on the Atlas Lola T70 and Ferrari (that's it in the middle of course, alongside an AMT and Cox Lola T70).
Very mediocre speed from what I've seen, and power to weight ratio isn't great; haven't seen any rewound...
The little AT206 and AT208s are great motors, and we have run them on pretty hot power too. A few have gone up in smoke, and that was the word on the BB versions, but I've never had that problem. They're one of the faster open frame motors you can use for 1/32 cars, and even for some lighter/smaller 1/24 cars. They fit just about everything too, which is a real advantage for F1 and sports cars in 1/32. Just seem to have a lot more "punch" than their larger brother.
Don