I tried one out on the range, it had a 9.5 loft and a fit on gold shaft, and I was hitting it around 250-290, (normally I hit between 230-250 with my Cobra). I tried a friends r7 425 and I was hitting it between 250-270, I've also heard that some people didnt like the feel of it, it also has a loud whack sound that takes some getting used to. As far as the fast swing speed I have know clue, I have an average swing speed. If you have a pro shop, dicks sporting goods, or any golf shop like golf discount etc. most of them have indoor driving ranges that have simulators, and you can demo it there for free
hope this helps