Anyone have any experience with the Zero-Max E1 Adjustable Speed Drive or anything like it? It says it uses a series of 4 clutches to reduce the input from anywhere between 0 - 1/4 of its original speed. It's rated for an input of up to 2000 rpm, and it seems to be fairly well made. That's just a general observation though...it seems fairly beefy. I'm not sure what it does to the power/torque of the output though. I don't know if using the clutches as opposed to gears or pulleys means that the speed reduction is achieved by pulling power out of the system as opposed to just simply trading decreased speed for increased torque. I'm not super knowledgeable of how clutches work, but I'm wondering if it basically transfers X % of the power to achieve the decreased speed. If not then it looks really awesome, and like something I'd like to pick up if I can find a good deal on one somewhere. I've found a couple for around $225, the same price I've been finding on the nice reducer pulley setups, but I also found a used one for $150. Who knows how good the clutches are still though. It might be worth the extra $75 to get one that hasn't been used. I'm assuming the clutches on these would eventually wear out just like the clutch on a motor or in a car. I've done just enough transmission work to know I don't like doing it, and I've only worked on the valve bodies...never made it into the clutch packs. Although, that could partly be due to having to do it stuck under a 2-ton vehicle with about 24" of space between the ground and the bottom of the car. Man I wish the concrete in my garage was thick enough to support a 2-post vehicle lift. Enough rambling...any thoughts people?