I got some battle axe heads with the left bevel last year and thats all I can say for now is they looked pretty good came with an okay factory edge which I'd need to re-sharpen like most others. I never mounted or shot them so I'm not sure about flight and penetration or noise but they looked very well made and I would use them and will once I get a decent arrow i can match them with,, have you seen the concrete block video on his website?.
I say if its going to be 2 blade then go with the left or right bevel just for a little more help with the blood trail,, if it doesn't work then penetration will be the same as a 2-bevel and if it does work like they say it should then its all good.
also,,, I wondering about screw-on broadheads (fixed or with adaptors) with left bevels... with my left beveled heads that are set-up for screw-in arrows I put strong locktight on the threads so when it hits the target the arrow is already spinnign "left" and won't loosen the point hoping the lock tight should prevent this....
I think if you havent set your arrows up yet you might want to go with right wing if the heads will be screw on just so when it hits its already spinning right which tightens the point. woodys I like left bevel..
with that being said if I using a double bevel (stos , magnus, snuffer) I don't mind the loosening effect that might happen at impact because its just "pushing thru" the target and doesn't need to turn in the direction of the spinning arrow to work properly and split bone better.
my opinion may be wrong, T