Most of my friends shoot mechanicals...mainly Rage. I've heard no complaints and seen no real malfunctions.
I've had good terminal experiences with the Rage heads, however, I did receive two new packs that had defective cutting blades on the point. The blades had been stamped, but never finished with a cutting edge.
You could see the flat edge from the stamp all of the way around the blade.
Fortunately, they were a Cabelas purchase, and easily exchanged.