Asics have come out with 2160s now, and it's time for me to buy a new pair. When I got the 2140s, they were the best shoes I had ever worn in my entire life. When I ran through those and got the 2150s, I got blisters every time I ran, no matter what I did. (And in really awkward places at that) Anyone know anything about the 2160s? Opinions?