This is a fine running shoe except something is wrong with the sizing.  I previously had a pair of NB 479 (great shoe but discontinued). I purchased the 479's in a store and size 10.5 was best in the store and best in use. So I purchased these shoes (MT573) in a 10.5 but they were significantly too small. I returned them for a size 11 and although I've kept them they are also a bit too small.