I've tried the 4", the 2.25" and the 1.5" QS and I gotta say the 2.25" are going to be pretty popular. The 4" were a bit heavy but wow they are agressive and work well. The 2.25" are more agressive than a right helical and the 1.5" work well for target and speed setups. I wouldn't try them (1.5") with broadheads though. I've settled on the 2.25" for both my hunting and target setups. Speed really isn't that much of an issue with the poundage I've dropped back to. I've checked out the blazers and to me there really isn't any comparison. QS hands down clear winner MAN I SHOULD WORK FOR THE COMPANY