I'm merely going to ask this. Is the deer more dead w/ a pass through than w/ a good double lung shot that doesn't stick in the ground behind the deer?? Dead is dead, period. If you shoot your bow well, and are comfortable w/ it, morally there is no reason for you to buy a newer bow. Yours kills them just fine.

Now, if you want shooting your bow to be more fun, less vibration, smoother draw, 3 times quieter and blazing fast.......Well then, that's another matter altogether!