Mark,
I actually only use my system for work at a dock, and would completely agree that if you are attempting to go up a rig underway then a purchase assending system would be preferable. That being said, I would really consider something like the self belay gear used by climbers.
There are a number of them on the market, and all works pretty much the same way. What a line is moving faster than some given there is a cam that locks the line in place, preventing a free fall. I haven't used these things before, but if you go up solo on a hand over hand rig it seems like a much safer way to come down than to click off the ratchiting block. Where one hand slipping from the line could result in a free fall to the deck.
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