I bought a new one a couple months back. I am happy with it. As far as it vs the hayabusa (which I have also owned) I do not see much difference in performance. Buddy has a 2011 Hayabusa and as far as 0-60 I pull ahead a little at 100 he catches up we are kneck and kneck till a bit after the 1/4 mile then I start pulling up over him again. We both are stock about the same size and ability. We gave also swapped bikes and the same thing happens. When I first got the bike we did lots of "testing" good time. I think the zx14 is a bit over hipped. 1/4 mile I would say is a coin flip from what we saw.