Tried my NA over the weekend, and where i can definately say its comfy, i gotta say at only 5' 7", it aint very long. I only had about 4 " either end of spare space so if i was any bigger i wouldnt really fit. It does seem to be on the tiny side, both in length and width. Im gonna sell mine on coz of the size issues.
Re build quality and design features, it is most definately top of the pile.