Why don't you just shoot a Slick Trick and then you get mechanical quality flight and cutting abilityandwon't have to worry about deploying blades, rubber bands, o-rings, weak or flimbsy blades, or any of the other draw backs to mechanicals.
In all seriousness, if you are really hung up on shooting a rear deploying broadheadI would look at the Trophy Ridge undertaker or smoke broadheads.