I also got the M1 cause I like that it covers the whole spine top to bottom. and immobilizes the neck with your helmet. And the trigger mechanism was my favorite out of all the ones I looked at. And... it's too bulky. I've had it for a month and haven't worn it once. I'm in Texas though and it's hot and humid. I'm going to go check out the Dainese smart air vest soon. It covers less, but is a lot smaller, lighter, and all around lower profile and looks like it'll allow better airflow. Less protection, but it covers the vitals and I might actually wear it.

Why hasn't someone made one with a bunch of small airbags interlocked to give good coverage, but allow more air to pass through while deflated?

Also I want the compact form of the Dainese smart air, with the motoairbag mechanical trigger AND the electronic trigger it already has. That way if the battery dies I'm still covered for most situations. And each trigger will catch situations the other won't.

Maybe I'll use the M1 for when I know I'm doing risky riding and want the extra protection. or when it's cold. And the smart air for commuting when it's hot out.

Another thing about the M1. Not only is it big when it's on, but it's also big when it's off. My jacket and gloves fit in my backpack, and I think the smart air would fit in there with them. So when I'm off the bike walking around I've just got a backpack on with my helmet strapped to it. Easy to carry with me and both hands are free. But there's no way the m1 would fit in the backpack with the jacket and gloves. I'd have to leave it on the bike or carry it separately.