For the length, choose a size according to the centimeters of your foot and not your usual size. For example, I wear a men's size 40 in VANS and ADMIRAL, and a 40 2/3 in ADIDAS, but I got the NB 650 in a size 40.5.
The shoes are comfortable and wide in the toes, while around the arch of the foot they are tighter. If you have a wide foot, it is likely that they will be very uncomfortable for you. The sole is hard, but it may soften over time. When they are tied, they provide very good support around the ankles and the foot, and they are quite warm, suitable for winter and autumn.
Overall, for the money I paid (95 euros), they are an excellent sneaker of very good quality. They have a slightly strange fit as they are generally narrow shoes but wide in the toe area. I find them very nice and well-made, they have exactly the same appearance as the photos on the website.