The explanation that many divers don't ditch weights due to cost has been replaced by the view that when divers get overstressed, they're not able to act quickly and decisively. Studies indicate the way to make a potential fatality a near-miss is to get a diver positively buoyant with the BC or by ditching weights. Our tests, which included all known types of weight systems, show that every unit will ditch. No one weight system is best for all divers. Although many systems can be released with one hand, ensuring you actually do ditch will usually require two hands and a pull, throw or drop motion away from the body.
All systems work best at or near the vertical position.