I asked for the Cumulus 13 and was given this shoe instead.  I own the Cumulus 12 and love it as it offers great cushioning and flexibility, plus it costs less than this piece of wood.  The toe box of this shoe is somewhat narrow and the shoe is very stiff.  Trying to run in this shoe even at a rate of 9 mins per mile is very labourious.  The shoe is light but far from being flexible.  I would not recommend this shoe.  I also think that the price of the shoe is too high when I look at what I am not getting from the shoe.  I am going back to the Cumulus and the Adidas Supernova Glide 3.