I have shot both the quick spin and the blazers, and I found the blazers to be by far the best vane I have ever attached to my arrows. The quick spins were quick to wrinkle and tear, where the blazers are so tough and ridged you about couldn't hurt one trying. They both seemed to steer my 4 blade muzzy broadheads and fieldpoints equally straight, but on my target arrows I found that I continuously had to refletch the quick spins.

As for reflex03's question, blazers won't help any clearance problems, but they will certainly be at least twice as durable as your feathers.