Strengths: Built around an Impact Guidance System (I.G.S) these are a good choice for mild to moderate overpronators. Designed with natural foot motion in mind - a combination of Gel pads and the Space Trusstic (the plastic bit in the arch of the shoe) cushions landing and propels you smoothly into the next stride. These give a speedy and responsive ride. I’ve been injury free so far in these and even in the last mile of a run I still feel I have springs in my legs, so I guess there’s something in all the technology they put into them. This shoe is packed with features, and although the Gel Kinsei have taken over as ASICS flagship model, for me, Kayano still remains the stability shoe of choice.
Weaknesses: With all that (sometimes frankly confusing) technology, the Kayanos don’t come cheap. Whilst I love mine, I am considering trying the cheaper Gel GT-2120, especially for racing as they are 27g lighter. I do find that decent socks are needed for long runs, because my feet start to threaten me with blisters.
Overall: Responsive, speedy and technology packed. Give the GT-2120 a go if you don't fancy forking out the dough for these - and get something lighter into the bargain.