I have had a Hit-Air vest (deployed twice at the track) and now wear an Alpinestars Race vest inside one of their Missile suits. I have not road tested it to date. I’m very interested in the Tech-Air 5 simply because it is designed to be used within the jacket. The first crash I had with the Hit-Air was on very rough and abrasive pavement and it was shredded before it could completely inflate. The Race vest can be set to Street mode and worn inside of a compatible jacket, but I find switching it back and fourth to be cumbersome, and still default to my Aerostich for most street riding. I prefer the Alpinestars system as it doesn’t require anything on the bike, somI can switch between machines without changing anything on them. The electronic systems offer the advantage of being independent of the machine and do deploy faster, but there isn’t any real test standard to judge the reliability and effectiveness of their deployments- but the same is true for the tethered systems. It comes down to faith in the engineering of the company providing the product. Alpinestars at least has the collected data from every suit sent back for recharging, and the last time I connected the Race vest to the mothership it got an entirely new program installed.