My experience is that every one of the quick release versions I have tried has either not released under load (pin type), or released unexpectedly (button type).

I also tried the ball/socket model, but could not get used to the setup. I was never sure if I was locked in.

Until ISAF comes up with a standard definition of "Quick Release" that the companies can design to, then no one is going to invest the resources to develop a good working model.

With that being said, and I am biased here, the Zhik trap harness with the velcro flaps on the side make it very easy to get get out of your harness when trapped. Just reach down, blow the velcro and you are out of the harness. We have several documented cases of 18ft skiff sailors being trapped under their boats, and were able to successfully blow the velcro flaps and swim out from under the boats.

However, If you want to try out a RWO quick release spreader bar, I have a couple I'll loan you.