I've never tried them myself but I've had a few guys try them and then come back and put on blazers. Somebody on another website did a comparison once. He had 6 arrows with quickspins and 6 with blazers. 3 of each had field tips and 3 had broadheads. They all grouped about the same but the quickspins with broadheads grouped consistently 3" or so lower than anything else. Also said they were a little more noisy.
As far as durability between the two. Blazers hands down...
For me, I don't need to switch or try anything different. Great groups with field points and broadheads, Quiet, and Durable...
For Whisker Bisquit shooters there's nothing better.