I vote for the cabrihna system.
1. Reliable only moving parts are high strength plastics and SS steel. The amount of pull on the kite has no effect on the amount of pull needed to activate the QR.
2. The strength of the moving parts and the simplicity of the design make it unlikely to fail and unlikely a user would assemble it wrong(there is really only one way it can go together).
3. Most of the parts are simple commercially available SS parts.
4. Many companies are using this design and it is quite popular
5. Again SS and high strength plastics nothing that really wears out
6. Reload is a simple process and can be figured out even without ever looking at the manual. And can be done in the water.
I believe the naish and the cabrihna system work on the same principle but the naish system uses webbing and ropes in place of the SS on the cabrihna system. It is also somewhat more difficult to assemble after activation.
The only change I would recommend for the cabrihna system is a wider diameter to it is much easier to find without looking.
Ozone leash is a perfect example. The safety release is larger than the surrounding material so all a person has to do is wrap hand around the leash and push away.
http://www.flyozone.com/gallery/main.ph ... emId=19427