DBE, a cut on impact BH is one where the blade(or razor) goes right to the tip of the BH. Typically most BH fixed or mech. have a chisel style tip on the tip prior to the blades(razor), while this will puncture more than a cut(think of it as forced entry, slows down the progress some what). A cut on impact will take less pressure to penetrate, as the cutting process is intiated on impact with the target, rather than delayed somewhat. Leads to less resistance and ulitmately should = further penetration/faster. It is not essential by no means, if you get them to fly well out of your compund they produce great results and what most guys opt for when using traditional archery equipment. Since a great number of guys shoot faster compound bows, the thought is they have more KE to produce enough penetration to use almost any head, where older traditional style string flingers needed more with less.

If you are chasing deer the point is some what moot with newer compounds, as they are fairly easy to penetrate...but throw in them bigger, tougher hide critters and penetration is a huge advantage. While a traditional fixed(chisel) style head has taken many a elk and moose, I would hazard to say a cut on impact would still produce better results faster regardless of the style of archery equipment used. However some find the traditional 2 blade cut on impact as harder to tune and fly correctly. Also the buzz now is more blades = better blood trail. You seem to see people follow trends or stick to what has worked in the past in BH' s. While i am guilty of doing the same with Muzzy' s, I have experienced cut on impact heads and with the newer style heads available in 100 grains they are something that should be considered.(especially when bigger game is on the menu) My experience with the magnus stinger 4 blade heads are, they fly as good as my muzzys, are sharper and show increased penetration.....given that I find it hard not to give them a go this fall.

More info than you probably needed, but hope it helped!!!