First I must get the "legatlities" out of the way. Please don't use mech's as a bandaid for a poorly tuned bow. Bow tuning is equally important here....Ok, having said that....

Mech's are awesome. They cut big holes which equate to more blood loss. Some guys don't like them, and that's fine. Good, quality mechanical work very well. Rocket, Rage and G5 to name a few.