The problem with flex bars is, they only flex in one direction, down. If you push them down, they have to come back up. When they come back up, they hit a stop. How much of the banging will you feel? I had a flex stem on my mountain bike about ten years ago that did pretty much the same thing. It took away a little of the really sharp stuff, but didn't help a whole lot overall. And It had an elastomer on top too (a much stiffer one). I've ridden a lot of bikes that were vibe monsters (H.D. sportsters, Parallel twins, BIG singles that weren't counter balanced) and the only thing that ever really worked was to damp the vibes with some kind of bar weights. Thats why you see them on so many street bikes now. They started on sport bikes because their clip on bars were so short they did not help at all. Now, it's rare to see any street bike without them. You can get rubber mounted bars, they should kill a little of the vibe, but, they tend to feel a little vague. Every one I know with rubber mounts, switched the rubber bushings out with billet ones. Before I shelled out the kind of cash they want for the flex bars, I would do much research into them. Find someone (not associated with fastco) who has used them for a while and see what they think. Or better yet, ride them yourself. Some people won't tell you they made a very expensive mistake. The mountain bike flex stem came and went, they were relatively cheap. You could end up with a very expensive ornament for your garage wall. Good luck.