I love them and have 500's for a 55 lb r/d longbow. My draw length is 30.25 inches. I have heard a lot of wheelie guys saying they dont like them. I love them! I have shot 200 grain field points into rocks and rebar and turned the points into blunts without doing any damage to the arrow. I just blew the nocks out, stick in a new nock and good to go!
Another nice thing is that they are skinny and slick finished which helps with penetration. I will say that you will struggle to crack 20% foc on them. I have mine tuned and they are full length with a 100 grain insert and 175 grain head and they are right at 20% FOC. They are worth the money as far as I am concerned. Tough as nails for a trad bow. As noted above, they are not cheap.