We built a system like that (to 15m), back in February of 2000.
I blacked out the very first time I tried it. That was the last time I ever used it.
The problem was that my buddy used it, then I pulled up the weight from the surface and got really tired. I then started breathing for my dive, and I couldn't get satisfied, so I overventilated trying to get satisfied. I then started the dive with the weight. If it had been CW, I would have had the urge to breathe immediately, since I was so depleted from the pull-up. However, with no effort on the descent to 53m (in an 8mm config), I never knew I was in trouble until the ascent. About halfway up I realized it was going to be close; I got to the surface, took off my mask, breathed then face planted in the water!
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Eric Fattah
Canada
http://www.liquivision.ca
"I encourage you to be free in the way you measure your success. I don’t claim to know what it will be like to be in your position, but I know that when you leave here, grades will be handed out differently. Your ability to gauge your success will largely depend on how you perceive it. You can shape it, set it up, feel it, and define it. Allow competition to turn inward. Do not depend on awards, money, or other validations." -Jonny Moseley
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