I'm glad I didn't invest in any. I did put on the Panaracer CG CX 700x32 tires and gear down my singlespeed to 38/16. If nothing else, it has added some cush and made riding against the strong winter headwinds a little easier. I actually noticed more confidence inspiring cornering, too, since the majority of NYC corners are peppered with debris and pitted, uneven pavement. Have also taken advantage of the knobs to do some off-roading. Just yesterday, I used them to ride from the UWS to the Croton Dam on the mostly unpaved Old Croton Aqueduct trail, pretending I was a CXer (great ride, by the way, if you want get out of the city). Here's to a continued mild winter!