Hit Air and Helite are the main brands for the tether based systems. The other systems are too expensive for me to consider. I've been looking at these for a while now as survivability and range of injuries seems vastly increased with certain types of crashes. The big issue is that the CDN exchange rate has made an already expensive piece of tech more expensive. I've decided on which one I potentially want and got a promise of a reasonable discount on one from a supplier (I'm not affiliated with the supplier and I'm not advertising so PM for details if you're interested). I'd be interested if anyone has one here and what they think of the vest or jacket. Did you think it was worth the money (subjective I know, especially if you haven't crash tested one). Do you wear it regularly? Does it flow air, is it comfortable?