I ran a FLEXX bar. It does provide decent isolation. But I understand what
@Bloak means when he says "heavy". If you are aggressive on the bike and are trying to pull or push on the bars, then these bars flex/deflect. They deflect without resistance because there is almost no damping in those polyurethane bushings that they use as springs. Very little friction or damping. The result is that if you are trying to pull/push on the bars, you are experiencing all the same pull/push forces but a split second later.
I tried a stiffer rear spring on my MXR, front forks pumped up to180 psi, and a FLEXX bar. The hands felt as if the fork pressure was a normal 160 psi.
Eventually, I went back to the stock rear spring, back to normal 160 psi fork pressure, and sold the FLEXX bars to Mrs.
@snydes
If I were to design damped handlebar mounts, or if money was no object, I would have designed/bought something like this:
SFS triple clamps is an hydraulic and pneumatic system in the bottom handlebar clamp. Improve the riding comfort, decrease the arm pump. Avalaible in red and blue.
www.nk-neken.com
These mounts appear to have some built-in damping in that system. Adjustable damping would have been even better.