But this shoes does not seem to have the cushioning/ endurance of more expensive models. (I have only found out about the features that this shoe had much after the fact when comparing it with other shoes on the New Balance site). I probably put something like 200 miles on this shoe before my knees started telling me that it was time to buy a new pair. What's more: I compared the feel/support of running in a much more expensive pair of New Balance shoes and found a significant difference.

Apparently, you get what you pay for. This shoe was something like $40 (bought in Hong Kong) and when I look again, it is no longer manufactured (I see why). For what it's worth, it seems that the number of miles that you can get out of shoes per unit of money is conserved across different models. So, the new pair of shoes has about 12 features (including "NB-x," which is an additional feature related to support that I didn't find in the other pair of shoes).

For the record, I'm a heavy runner (225# and 6"3+) and am accordingly hard on shoes.