I have the standard Hit Air and have fallen off with it once and set it off once deliberately.
I can thoroughly recommend, it's better than the point 2 as it covers more of the body and I believe it does this faster. Its very light weight and you forget you are using it.
The after care team is amazing, Rachel at Hit Air was a total superstar with my Air Jacket when I sent it to be serviced and for the first time in Hit Air Ltd's history the parcel went AWOL. Thank God I'd had special delivery or whatever it was called, I was insured for the value and Rachel sent me a spare until mine was found.
BEST TIP - before you buy your chosen air jacket have something connected to your clothes that you can tie to your saddle - bit of bailing twine, string, whatever, I tied a bit of string to a loop on my jods (in case I forgot to disconnect). Then for a few days/weeks before you buy your air jacket practice 'connecting' it as soon as you mount, and undoing it as soon as you finish riding.
That way your brain is 'taught' and you don't waste expensive cannisters forgetting to disconnect the lanyard when you buy your jacket and you jump off!
I also have the added advantage of only mounting/dismounting on a mounting block (due to disc issue) so therefore the lanyard is never stretched on the few occasions I did forget to unhook