I have the UCD on order myself, and a new 91 fs II waiting for it. As for the pumped version, it doesn't make any more power at all, just allows you to mount the tank where ever you want. I saw one get horsed around very well with a Saito 91, so i'm confident the Surpass II will do a great job, considering they typically make a little more horsepower, although weigh a little more then the Saitos.