I've had digital cruise pro on the moomba and now zero off on the supra. Zero Off engages speed much smoother than digital cruise pro ever did, however it was much more noticeable when surfing. With ZO you can't overshoot your speed, it brings you smoothly up to the speed that is set, which is very helpful for less experienced drivers when you are behind the boat. When surfing with DCP, say speed is set at 10.5 it would engage at around 8 and take 15 or so seconds to get up to 10.5 unless the driver works the throttle just perfect. Zero Off engages very smoothly every time when surfing. For me zero off is a better system but if you don't plan on surfing much DCP is a very good speed control system. The surfing problem I had with DCP may have been easily resolved by changing some settings but I never tried for fear of making it worse.