If you have a narrow heel but like a little toe room you should give these a try. I was using Brooks Cascadias, but these are superb. I particularly like the Michelin soles. While flexible and light, they are still strong and have an aggressive tread. I'm currently wearing them on the AT, and won't replace them with anything else when they eventually wear out. I'm a 10 in street shoes, but bought 10 1/2 for trail use with mid weight wool socks. Perfect fit.
This review was written in the old system and had content requirements that are different than reviews written today.