Typical outstanding New Balance product. I tried the 559s since I only walk due to my neck surgery, but found them an inferior product. The 623s are similar in cost and just feel better. Kudos out to the shipping/handling people that processed my order! I had the shoes in 2 days. In comparison, I ordered another product through Amazon at the same time and it was still at te sellers facility by the time I had my 623s. Oh, they will be here in next Wednesday, some 7 days slower than the 623s got here (if it shows up Wednesday!!!). Go figure how that happens?