One of my first cars was a 1961 Morris Minor Traveller with after market lap sash front seat belts mounted through the timber frame. As seat belts go, they were pretty primitive; they certainly hadn't been barrier tested and it was not a car I would choose to have a significant crash in. But those primitive seat belts were a major improvement on the car as it left the factory. Modern seatbelts are far more sophisticated, right down to pyrotechnic tensioners and deliberate Z folded weak sections to ease tension controllably, but does this mean we shouldn't have bothered with seatbelts until we'd reached this level of sophistication? Of course not. In 1993, as a student engineer, I was working at GM Holden in Australia doing lab testing of car components, including the steering wheel for Holden's first air bag model. That air bag typically would not go off in a side impact or a rollover. But in a significant proportion of collisions it provided worthwhile protection. Side airbags are now common, but we had to start somewhere. The first generation motorcyclists "airbag jackets" inevitably will have shortcomings that will be improved upon. They will get better and cheaper. And at some time, the increasing sophistication of protection provided and the decreasing price will move them from "wtf?", through "a neat idea", through "I'd like one of those", through to "I don't really feel comfortable riding without one". For some of us with high mileage and high income, they've already arrived at the last stage. For me they're at "a neat idea" at the moment, but right now I can't afford $400 for an early model to replace two perfectly good jackets I currently own. I can believe that my next jacket in say 5 years might have a much better one for a premium of around $100. I might add that self inflating life jackets using similar technology and the same cylinders are already at similar prices to quality conventional life jackets, and have reached the "I'd like one of those" stage for me. But I've got a good quality conventional life jacket which I am reluctant to discard.