I shot 4 bladed Muzzys from 1996 up until the end of last years season. They were 90 grain and I never had aproblem with arrow flight, impact or blood trail. I just switched to 100 grain 3 blades this Fall and will be shooting those out of my Guardian this entire season. From what I can tell, these heads fly just as good as my other 4 blade heads. I've been shooting Muzzy's since I started bow hunting in 1996 and I intend to keep using them. To each their own.