You'll understand them right away when you get the whoopies...just BE CAREFUL! If there isn't a bead/ziptie/etc. on the adjustable loop it can be very easy to pull it all the way through. It takes forever to fix this problem.
I would def. lose the descender rings and use some sort of toggle to shave a few oz. I stopped bringing aluminum toggles with me, and just spend an extra minute or so looking for the right size/strength stick.