If dj gets them back in stock I hear his h bridges are good but right now he's out. I know a few people have tracks or SWF and in turning there's a spike in Amps as if they are stalled. This is a great motor controller than can use encoders and carry the right or left motors automatically or when in straight forward it makes sure all the motors are producing the same power/ rpm. It's rated at 4.5 amp per channel. This is particularly ideal for setups where multiple motors need to turn.the same speeds , that's hard to do using seperate controllers.