Soles have longer lasting rubber, with a thicker heel, making it ideal for those longer runs. Toebox is wider than other models, ideal for wider feet.
Cons:
Price...still a little high for me.
I received my shoes a couple weeks before the actual release date(mid-Sept. 2009). Did a 5 mile run out of the box. The shoes are very comfortable...about as comfy as my old Nike Vomero 2's, but with lugs under the forefeet. I'm hoping to use these as my long distance shoes. I don't feel the lugs as much like my other Newtons(Gravity All-Weather, Motion Stability). The soles seem a little stiffer than the other models. If you run in Newtons already, you should definitely own these.
Newton Sir Isaac Guidance Trainer
I received my shoes a couple weeks before the actual release date(mid-Sept. 2009). Did a 5 mile run out of the box. The shoes are very comfortable...about as comfy as my old Nike Vomero 2's, but with lugs under the forefeet. I'm hoping to use these as my long distance shoes. I don't feel the lugs as much like my other Newtons(Gravity All-Weather, Motion Stability). The soles seem a little stiffer than the other models. If you run in Newtons already, you should definitely own these.