Quote Originally Posted by MDHillSlug View Post
I find them a little harder to mount. When they are brand new they don't readily hold their normal shape. I also find them a bit harder to properly seat the bead. Why bother with them? They are usually lighter and they are supposed to give a more comfortable ride and corner better. They're easier to ship, too.
A good reason to have them is if you are on a multi day tour in areas where there are no bike shops nearby. If your tire gets badly cut or chewed up somehow, you have a replacement tire with you. Carrying just one could cover a lot of possible tire disasters for 2 or 3 people if they use similar size tires.