One thing I found out about mechanicals is they are... mechanical. You have to check them out to make sure all blades open completely, and swing freely before hunting with them.

Out of 4 batches of mechs, by 3 different manufacturers, only one package contained heads that were ready to hunt with out of the box. The other three had to be cleaned out, have burrs filed off or had to be sharpened before I would say they were ready to go.

Once they were fixed, they functioned perfectly in my tests. But, I never could bring myself to shoot an animal with them. I have complete confidence in fixed blade heads. I can't say that about mechanicals.