They are what they are, no nonsense 6 to 12 volt speed controllers. They are 16 pounds each, you need 1 per motor. So for 32 pounds + p&p you can drive your featherweight with more control than relays and you dont need a receiver battery anymore.

They dont do current limiting, so you can blow them up if things go wrong, but at a rating of 100A forward and 60A reverse it is not a small task to do so. Mind you, its not like its never been done before.

That pretty much all i can say about them. No more, no less.