Faria also make a digital. I've used it for about three years. Works pretty well except the buttons are a little awkward to use when you have to press them both together to get to some functions. My dist. shows a retail price of $247.20, which is usually high.
part #'s FFM001 for blk. FFM002 for white
The pistons have to work harder to suck in the fuel-air mixture when the throttle position results in low intake-manifold pressure. Under this scenario, deactivating some of the cylinders allows the remaining active ones to have less manifold vacuum to overcome during the intake stroke.