I have used this shoes in several marathons and 2 ultras (1 80km and 1 100km).  I have had no problems and finished in a more or less decent time.  Only in the 100 km ultra did I ever get any blisters.  But its probably because of the distance than the shoes.

They are very comfortable and once you put them on, I swear to you, you'll be motivated to run.  I weigh around 165 lbs and they carry my weight pretty well.

The color happens to be my favorite as well.