Yeah, Wally and I have the same concern.  I want to be able to get down to at least 25 - 35 feet for Walleye and more if I wanted to use the same system for trout in late summer.  The Rock-Runner is only going to be good for 15, maybe 20 feet.  The advantage of the Wing-it system is that they include a full range of weights from ½ oz. right up to 4 oz.  So I'm going to give them a try.  The Rock-Runners look like they'd be worth a look, though, along with those heavier pencil bouncers that ST pointed out - just to compare.