I agree with what was stated earlier that the 2.25" versions work great for field points and small broadheads. I used them last year and loved them. However, when I switched over to my broadheads (Magnus Stingers) I wasn't happy with my groups past 20 yards so I went back to the 4" version. My only compaints are that yes, they aren't quite as durable as I would like to see, they are slightly on the expensive side, and it seems like the 4" version creates some additional noise while the arrow is in flight. However I do believe they fly great and really helped to improve my groups downrange. Also with today's dropaway rests I'm not quite as concerned with damaging the fletching due to contacting the rest.

NAP is releasing a 3 1/8" QuikSpin this year and I plan on picking up some of those to try out. Hopefully it's enough to stabilize my broadheads a bit better, reduce some of the weight compared to the 4", and also cut down on the noise as well.