The Rev's right: Butch A gave you the best specific advice.

I shoot both fixed blades and mechs -- but I only shoot mechs because I am very fond of their devastating performance and quick, clean kills I've experienced with them over the many, many years I've hunted, not as a band-aid to fix tuning issues.

Mechs need to hit with as much straight-on force and kinetic energy as possible -- just like their fixed-blade brethren. Before you start using them, make sure your bow is perfectly tuned. Start with paper tuning, then go to Butch's walkback tuning method. You'll be getting really close then.Then, if you want to try mechs, I'd say go for it.

God bless, and good hunting.