All valid concerns. However the BAR will take care of the mech problem. I know..I've shot mechs out of them (and AFAIC, broadheads and arrows are disposeable when it comes to game).
While I certainly am not going to say that the ST AXIS may not exhibit some problems in the future, I've got several hundred shots on 6 different arrows and no problems yet..I don't forsee there being any problems. I've been abusing the hell out of them and inspecting them daily. These things are TOUGH.
Well I have one issue with them..the paint/graphics come off too easily
Well...make that two issues: I also need replacement nocks (busted several already) and they are not available.[

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As a further example of lack of insert problems, I had one stuck in my "black hole" target the other day w/a broadhead (broadhead sticking out the back 6 inches or so). Well for those in the NorthEast you will know it went from rainy and 45 to 15 degrees overnight and my target froze with all that water in it (and my arrow froze in it too). After 2 days of being frozen in the target, I yanked on that arrow for 10 minutes trying to work it out of the target (couldn't find my gripper). Well when it finally pulled through it felt like the insert came out and was stuck in the target...but lo- and behold, the Razorback was still there and solidly attached. Arrow spun perfect too.
I'm not trying to sound like a broken record and I don't work for Easton (boy I wish), but I am damn impressed with these arrows..and I'm sure most of you know I'm not impressed with much in the realm of carbon arrows. If these ST AXIS do indeed pass the "longevity" test ,this is by far the best Carbon arrow to hit the market in 10 years AFAIC.
:steps off soapbox: