Personally I like both, having gone down once, and hurting my sit bone so I couldn't ride for three weeks. No, you don't need them on all the time, so you get a set of cheap rims, since you're using them in the winter and swap them in and out, like I do, it's slick.
Check out Peter White's page as well, he states he's had customers order just the one tire, and then call up and order a second, having to pay twice as much for shipping.
http://www.peterwhitecycles.com/studdedtires.asp
Last edited by naisme; 12-08-03 at 04:35 PM.