Yep they have their place. I've been riding my 2.4 Conti X kings on light but not race wheels all spring. I finally put my race wheels/tires on and the difference in speed was worth a gear or two. It was fun, but I wouldn't use that set up for anything with sharp rocks or pound rock gardens like I do with the fatter, heavier tires and burlier wheels. It really reminded me how much slower a heavier duty wheelset is compared to a race wheelset.