i have both the kayano's and gt's. kayano's though more expensive are worth spending the extra money for. it's great when you have to travel a long distance running or walking.
The only brand of athletic shoes my entire family wears is the GEL-Kayanos. Once you put a pair on, you know what I'm talking about. There is so much cushion and support, you feel like you can exercise or just walk for hours in them. My athletic son loves this particular one. I've already ordered him the next size up for when he outgrows his present pair.