I have the Chomps and dual height risers on my boards too.

While it sort of works, it seems like a problem waiting to happen. When both heel risers are folded down and the tall riser is above the crampon (locked down for side-hilling steeps), then things are kosher. If the crampon is in free-hinge mode (above the high heel riser), then the crampon puts a huge upward force on the touring bracket when you push your heel down. I am worried I will tweak the binding base or break my LT setup. In the low heel riser position with the crampon’s climbing bar raised, it again puts a big upward pressure on the touring bracket. With the crampon’s climbing bar lowered when using the low heel riser, the teeth don’t engage the snow all that much (sort of 1/2 on). With the tall heel riser raised and the crampon’s climbing bar down, the crampon lifts almost completely off the snow. With the tall heel riser raised and the crampon’s climbing bar up, you get most of the crampon’s effectiveness.

So there are a LOT of scenarios with the old Chomps. And they range from crappy, to so-so, to pretty good depending on what heel riser and crampon bar combo you use. Spark would have me believe that things have improved with the new Chomps. And I want to know why they claim it’s so.