I was riding knobby tires on my hardtail that I use for commuting to work, riding with the kiddos,and kicking around town but decided to opt for these when I saw them on sale at Jensonusa.com. I'm glad I went for them as they increase the fun factor for my pavement rides. These roll much quicker and accelerate much faster than what I am used to in a knobby (obviously) or semi-slick so I'm a fan.
Overall these have held up well (no flats or slashes in the sidewall so far) and they have a really cool look to them as well, which has led to a number of comments about them by random strangers. I keep my knobby for the dirt days but these are great for what I use them for. The price made them a no-brainer at $17 a piece. The version I have and am reviewing is the 2.25 size, though you can get them in a slimmer 2.1 as well.