I'm no pro, but I've logged a few miles over the last 25 years, and I used to be able to buy a pair of shoes that would last me for quite a while, or so it seemed. Now, durability seems to be a concern of the past with shoe manufacturers. Everything I buy in my preferred brand begins breaking down after a few weeks, or so it seems. It's like every year the idea is just to come up with colors more hideous than the last's and to get out version 356 of the shoe, whether or not millions of people actually liked the existing version. I spend hours combing around on onine looking for my tried and provens on sale somewhere, but to no avail, even though they were just released a few years ago. Meanwhile, the new releases get lighter and lighter and the product is just more and more crap. I guess it's okay if you're a millionaire and can afford to change shoes every three months, but that's not me. Have a nice run!