I dont have them yet but I plan to pick some up because I have been told my many people that it really makes a difference. The bike store guy keeps trying to sell me a road bike. He says it will greatly improve ride quality and speed but right now in my situation it seems really irresponsible to drop $800.00 on a decent bike (even though I would put it to good use and get a return on my investment). I have been scanning Craigslist but it's difficult to judge what is decent or not because most of the sellers seem like they dont even know much about the bikes they are selling! So I'll keep my trusty MTB and mod it to work for me. Next purchase: new tires for sure.