I was wrong on the deployment time. Hellite - a recognized brand touts 0.1 seconds with the cannister. Hit Air touts 300 milliseconds, 0.25 and 0.1 seconds depending on model. Flyastar (Chinese) does it at 0.5 seconds (has both Chinese and European Safety Certifications). Most of the ones I find on Aliexpress touts 0.5 seconds (to be trusted?). Now, 0.5 seconds to full deployment may be a bit long if you hit something dead on while on the bike - like the side of a truck. But, hit the side of a car and go flying over it, then 0.5 seconds should be enough before you hit the ground.

As for lanyard - this is the only deployment mechanism I would ever conscider for everyday road use - not one based on me having to remember charge batteries and also counting on not only the electronics and software working, but also to the deployment mechanisms in addition.

You need a very hard tug on the lanyard to deploy it, so much that the risk of accidentally deploying it is very unlikely - atleast on the tarmac. Offroad, accidentally dropping the bike, with you tethered to it - could deploy it if the tether is short.So,in a close to stand still tumble - you might not be so happy with the airbag. In conditions where this is a risk, running with a slightly longer tether might be a better compromize?

Unlike a car where an airbag is a one time only - motorcycle airbag vests are intended to stand up to several uses...

The main concern is not so much wether a tethered air bag that deploys at either 0.1 or 0.5 seconds is a good idea or not. I'm pretty certain that they protect far better than the plastic pads we wear (which could still be worn). I can see a future where wearing airbags in Europe becomes law (unfortunately). My main concern is wether or not the stuff on Aliexpress is any good. Vests from Hellite for instance is prohinitively expensive.

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