I really love these shoes, but they are just a bit too big, so I’ve ordered the 9’s. I’ve only done 3 × 3 miles easy on roads, but am swimming a bit in the toebox. These definitely run ½ size large. If you have the Zen, these really feel like a higher, more propulsive version of those (another fave of mine- another one I had to swap to a 9- you’d think I’d have learned).