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I was very leary to put these to work with my one string kllin machine but I figured it couldn't hurt to doll up the bolts I had already shot the vanes off of so I went ahead and tried em out and in my opinion they shot just as good as the firebolts did with the original 4'' vanes from the factory. In addition, these are clean and easy to put on,and I imagine they shouldn't be to bad to take off. Now one thing I am concerned about is how they will hold up in the event of a pass through shot. I won't really mind because I'll be doing the back strap boogie and these things are 6pcs. for $20 at my local outdoor store... I shot them into the middle(By middle I mean depth not poi) of my layered target and it didn't seem to hurt them at all. I did notice that they hum in flight just a little bit, probably due to the molded lip(very small) on the tip of all three vanes to make it spin faster. I honestly don't think the deer, turkey, yote, and various other quadrupeds I barrel down on will mind. To each is own, I like them and will probably continue to replace damaged vanes with these instead of the traditional 4" vanes. The ease of using these things I think are what I like the most, just place on bolt and dip in boiling water... Nice! If anybody has tips, suggestions or if there is other products like this that work better let me know... 15 days til season here in Ohio, good luck to all and be safe!!!