Been R6 fan but they are very sensitive to alignment (uneven wear). Just came back from VIR event and have all good things to say about this tire (C51). Takes a couple laps to warm up when stone cold but no different than R6's. In terms of grip, unless back to back, wouldn't be able to tell difference between these and Hoosiers. Seems to be more tolerant of alignment changes. Will need to report back next season regarding how much longer they last vs. Hoosiers. I have 10 30 min sessions in instructor group on these and they seem to be in much better shape vs. my R6 experience. They also hold their pressure better than R6's on my OZ allegeritta's - R6's randomly lose pressure over time - sometimes does, sometimes not depending on the rim. I would definitely use these moving forward...even for races. if they last longer, grip just as well, and are cheaper, I really dont see any reason to go back to the hoosiers. Sorry, want to buy american but not with that big of a value difference! Only issue is that it is not always available so need to plan ahead and order a backup set before you really need them.