well you asked for it so here is my 2 cents. I have shot both fixed and mechanical broadheads and am still undecided on which i like. i have shot quit a few deer with the fixed and had some that i didn' t recover with a fixed. shot a nice 8 point square in the shoulder, got about 4 inches of penetration and never found him. shot a nice 6 point quartering to me with about 8 inches of penetration - never found him, 2 does with pass throughs and never found em. sorry about all these experiences but they definetly made me a better hunter as i learned from my mistakes. killed many other deer with fixed head but those were some examples of a fixed blade with poor results. some hits it wouldn' t of mattered what head I used. by the way the fixed head i used was a thunderhead 100 gr, 28 inch beeman ics 400, 60lb draw. switched to the spitfire last year, shot 1 doe through one lung and come out gut. found her next morning but very poor blood trail as hole plugged by intestines. also had same result with fixed head. this year, shot 1 doe with spitfire. first shot spined her. had to get down out of stand and finish her off. 2 shot was on ground level and I got a glancing blow off her chest. had to shoot a 3rd arrow at her to finish her. i shot a buck with the shock wave, quatering away, arrow entered left high behind shoulder and exit hole front right chest without pass through. so heres a summary

1. doesn' t matter what type of head you shoot if the shot angle is bad or you hit the shoulder in the knucke joint
2. you won' t always get a good blood trail if your arrow exits through guts
3. the mechanicals I have shot can give you a glancing hit unlike fixed, although I think the shock wave has eliminated that problem with the blades opening very easily and not requiring as much KE as the spitfire
4. mechanicals will give you a bigger hole and more of a punch with the hit unlike the slicing through hot butter with the fixed blade
5. mechanicals shoot exactly like my field points unlike my fixed which tend to fly low and right
6. like someone else stated earlier you can kill em with a field point if the shot is placed right so just shoot what you like and pick your shots carefully as we owe it to the animals we hunt to make a clean ethical kill!!!!