I am about done with the asics speedstar 5's they are just too stiff eventually I would like to move to a 4mm drop like the Brooks Flow but I know I would probably need another go in the 10mm drop shoes so that brought to mind the new Nike lunarfly 3's and the Puma Faas 550. The shop had the Puma 550s although I had to size up 1 whole size they did feel more flexible than my asics but I wanted to compare them to the nike lunarfly which the shop did not have. Has anyone ran in either the Faas 550's or the LunarFly 3's? Advice appreciated!