Love the 2170s more than the 2160s. Slightly updated - same functionality and comfort. I'm a moderate over-pronator and the 2170s work as well as the older 2100s. As usual I wore these right out of the box...love the purplish pink and gray/silver colors. These are not going to show dirt. I am a size 10 in Asics except when I wear them for volleyball (go up to a 10 1/2) and I purchased a 10 in this style - fits fine. I felt like the 2160s ran a tiny bit big. If you play a court sport in these you may want to order up a 1/2 size. I usually order from Zappos (love them) but had an Amazon gift card I wanted to use. Went with RoadRunner Sports through Amazon and they were great - timely and the whole nine yards.