so i just took the flyknit ones out for a spin tonight. did a 5k at close to my max effort (which really isn't all that great). the lunar soles, no surprise, were much more comfortable and no foot pain whatsoever. there's also more padding cupping the heel, which also was a great benefit. the shoes themselves were still very light, but a significant weight difference from the gen 1 FK trainers. again, no surprise, and they're still very light/lighter than frees, but not near-barefoot light like the original FK's