I am, yes, so long as you go by the recommended elastomers. If you use softer ones then obviously the compression is greater and the angle better. . but that leads to more pogoing. I did a bit of analysis in photoshop and figured out that for small-medium sized bumps, as the rear wheel is raised the saddle moves along a near-straight trajectory, i.e. it's an arc so wide as that the curvature is negligible. The angle of that motion is around 37 degrees. The thudbuster doesn't get near that until far into the arc. At 37 degrees it's true that there's a lot of horizontal as well as vertical movement occurring but there's still more vertical than horizontal and with firm elastomers the opposite is the case with the thudbuster. So it efficiently dampens front to back movement but not so much vertical. So I guess the aspect of the design that's made it so popular is the lack of sticktion rather than the efficiency of the motion.

I guess if your saddle has the right kind of give then that combined with the thudbuster motion could be very efficient.

Unless I've misjudged something, though I can't see what that could be.