I've had less stellar results than Roy with running four motors. I have several sets where it worked pretty well, but then a couple of others the cruise behavior was almost nonexistent.
I have to disagree about the drive FET's. While in a perfect world they'd not dissipate much power, I've replaced FET's due to stalled motors on a number of Cruise Commanders and Cruise Commander M boards. I've yet to have to replace the bridge rectifier on any of them. I can't comment about exactly what in the design makes the FET's vulnerable to overload, they certainly seem to be the weak link in the chain.
