I purchased these when the 1540, replacing the 1123s, did not work at all for me. I am a regular but casual runner (about 10 miles a week) with low arches and thus I overpronate. I have been running in these for several months now and I really like them. The front of the shoe feels more flexible than the 1123s, which allows me to move my foot around for a little less restrictive stride which I enjoy. Even with that, and without the Rollbar, they provide plenty of stability for me. I love the cushioning and do not feel any knee or hip pain when running on roads or sidewalks.

However, I wish the heel were a little narrower and the toe box a little wider. For example, I clipped my heel working out in the house and the shoe came off, and I can feel the shoe press against my outside toes, although it is not uncomfortable. Also, I was not able to use any insoles with these shoes--it made the shoe so tight that my toes went numb. However, they turned out to be so supportive and cushioned that I do not need any additional insoles.

The shoe runs true-to-size, though I purchased a half size larger, as I do with all my running shoes to accommodate foot swelling during runs. I plan on buying a second pair of these shoes.