I am not a runner, but I am very active both at the gym and outside.  I purchased the 2A and it is fantastic for narrow, low volume feet.  It provides just the right amount of cushion.  My foot feels very stable and supported in the shoe.  Yet the shoes are very lightweight.  I always use my own insole for more support and like most other shoes, the insole in the Ghost is worthless.  I have received several compliments on the shoe too!  They look streamlined, not clunky.