There are several heads on the market that have been around for a long time and for good reasons- there good heads.
I was in Alberta bear hunting several moons ago, there was a celebrity hunting couple in camp working on one of there "bear" videos, one morning he was walking up to us hunters with a brown paper bag full of expandable spitfires handing them out he got to me I told him no didn't want to shoot that %#@*, I shoot, at that time, eskimos I got a cold shoulder from the both of them for the rest hunt.
Pushing gadgets, money, and fame that is what drives the industry, so it seems.