I am in the process of setting up an indoor training program. I have looked at the Computrainer and the Velodyne. Both seem to be good systems. I have thought about the possibility of getting a power-tap or some similar measuring device so that I could use it indoors as well as outdoors. My question revolves around the training device. Rollers or a Trainer. I have read the Kreitler rollers have a fan option that offers resistance but I can't find out how much. Does any one know how effective of a training program that I could create with a Power-Tap and a set of Rollers? If someone has some experience that would steer me away from Rollers for resistance training I would appreciate it. If not, then maybe that would be a great way to train indoors.