Strengths: I have extremely narrow feet so the narrower forefoot is spot on for me. I also really like the enhanced cushioning and overall snug fit. They just feel so much better on that my Kayano 16s and, in turn, I feel like I'm lighter on my feet when I run in them. Fab shoes !
Weaknesses: Is the Kayano 17 slightly wider at the heel ? For the first time ever I've had to thread my laces through the very last hole. If I don't, they are a little loose at the heel. But, given the vast improvement elsewhere, this is a minor niggle which I can definitely live with.
Overall: I've always liked Asics shoes and, in fact, since I started running 7 years ago, I've always (bar once) run in Asics - and the "bar once" was a total disaster. I had my gait analysed at an Asics roadshow in Edinburgh 5 years ago and it was the Asics guy who put me into Kayanos. It was a good move - the right move - but the Kayano 17s are the best !