Would these bindings do well on a K2 darkside? At 128 underfoot I am wondering if they wouldn't handle it..
It may depend on your use. Hucking 40-footers may stress the binding a bit... The new Radical FT has more beef. There is a support plate under the toe piece and a larger, stiffer carbon connecting plate between the toe and heel. They should be back on the Backcountry.com site in a few days.
I've got some on the BD Gigawatt (135 underfoot) and they work great. Skiing soft snow obviously. With a Maestrale boot, so it may depend on how beefy your boots are. I think the "support plate" is bs, but that aside they do have a solid track record of being up for the task.