this being my first true track frame after about a yearand a half on a conversion,i'm blown away. still getting used to what it is capable of, and how quick it is. very stiff, very tight and responsive, but again, ive never had a track frame to compare it to. threading through trafiic is getting "extension of body"-like, the absolute subtlest movement translate into big results. biggest thing to me is the BB height...i'm so trained to know what lean angle will inevitably end in pedal strike, and even when i push this well past it to where i'm waiting to hear that scrape, i look down, and i still have like 2 inches. sweet! once i trust/ get used to this frame fully, it will be insane. toe overlap...scared the **** outta me at first, but my cages were too big anyways. scaled down to M's, and with 170's i have to lift my toe the TINIEST bit if i'm like threading through cars real slow. this is on the 56. i don't even think about it, it's no problem at all. this bike is stiff, but i definitely would not call it uncomfortable at all, even after so long on a relaxed geo. road frame. i do ride a brooks B17 tho, which takes a lot of the shock out. acceleration...i upped my gear when i built it, so i'm still getting used to that, but again, super responsive, especially from an easy cadence to full sprint to beat the red light. altogether, really plaesed with it. a little more new school than i planned on, but i got a great deal from my friend, who it was too big for. on that note, get a size smaller than you would usually ride, the top tube is deceptively long. i'm 6'1", and the 56 feels good. good luck...