After being told by several of my running friends that I had to give these a try, I finally gave in and got a pair. To say that I am satisfied is an understatement. After a month of running in these, I have better form, am striking more consistently on the mid-foot and am running more quickly. They are very smooth and seem to propel you forward with every step. The upper has a very close and comfortable no seam fit and a little feature that I love is the sausage laces. The tread is suitable for hard pack to mildly rocky terrain. I feel that they are pretty true to size. For comparison, I wear an 8 in most Inov8 models, the Brooks Cascadias, & most Salomon models and wear an 8 in these.