I've been doing some research on suspension systems for hammocks or tensioning systems for (ridge) lines.  It seems that many of the discussions always seem to revert to one of two choices when it comes to (a) easily adjustable and (b) light weight:  whoopee slings and O-rings.  A whoopee sling works on the same principle as the Chinese finger "handcuff" and the double O-ring is a pincher system.

They seem simple enough to use and should save a lot of set-up time and fiddling. 

Anyone have any experience with these systems?  Any "slippage when wet" issues?  Do you use the double O-ring w/ w/o carabiner?   

dd