So I've had these for about 4k now and thought I'd post a review. I'm running the 190/55/17's on my fireblade. Initially, I did not like this tyre at ALL. My old bike was a 600rr and I ran Pirelli Angels and I felt they were an awesome tyre for what I was doing - daily commute + occasional track day. I never worried about grip on them even in the rain. These Sportsmarts I feel, on the street, take a long time to warm up. And until theyre good to go, they feel VERRY..slippy. However, I'm also not used to the amount of wheelspin im getting on the thou so that has to be factored into this review as well. They are ok in the wet, but as I am not as confident on the tyre as the angels, it transfers to all conditions. One thing I can say about the tyre is they do provide lots of feedback. And by that I mean, you can feel it slipping, a lot, but that does not necessarily mean its about to let go. Since running them at QR on wednesday, I have to say, I really, really enjoyed these tyres on the track. Although I purposefully limited any wheelspin coming out of corners, I could produce a very healthy acceleration roll-on from decent lean angles, and did feel very confident in doing so. Another thing I did notice was that my tyres were used all the way to the edge, as you can see above. On the angels, there was always a small chicken strip at the very edge of the tyre, even though I was scraping pegs quite often on the 600. I only scraped pegs once on wednesday, but was still able to use all of the tyre. I ran 27 psi on the track, as recommended by the QR boys, and felt very happy with the grip I had, but reading this page: http://tinyurl.com/3guh384 suggests you can run them even lower, at 21-24 psi. As you can also see below, after ~4000k's commuting and one track day (photo was taken after the last session), there is still plenty of tread left. I paid $449 (was misquoted and they had to honour the price), however was told that they retail for $529 - from team moto. I don't know if I'd pay full retail next time round. But I am tempted to if I have to.