Quick release can mean accidental release too.... this is the debate that has been going on with ISAF.
Myself and quiet a few other sailors I know have had these units fail or release, resulting in man overboard, boat breakages and sometimes complete seperation from the boat. I will never use a quick release system again. The risk they pose to sailors far outweights the benifits. i believe a good knife is more important. Strap one on the underside of your rear beam and one on your harness.