I've got both the mks lambda and the ergons. The ergons just fit, the curve puts your foot in the right position every time, I have to futz to get the feel right with the mks. They look hugely dorky, but are light, strong and support your whole foot. I find the various mks pedals either too narrow or too short for me. The lambdas are nice but I'm switching mine out for the ergons. The mks are fine till about 15 miles before I find them uncomfortable.