The Team USA sprint team has numerous Watt Bikes at the indoor track at Velo Sports Center in Carson. Every time I have seen them use them, it is for puke intervals. One can push oneself harder on the Watt bike became if you become sick, you puke and do have to worry about crashing.
Looking at the literature, it looks like any other integrated indoor cycling bike but maybe more accurate and set up for training. If it does not workout out, it has a lot of places to hang you clothes after an outdoor ride to dry.
