The eBay one seems to be a single direction speed controller that drives the two motors in the same direction. I guess 2 of those would work fine in a 4wd setup, but there are some cooler (£15 more expensive) 60a ones on hobbyking that I'm going to run in my new featherweight. Again, I'm getting 2 because they are single channel, but are good for my 4WD setup.
							
						
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Speed Controllers - Making Sense Of It All
				
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