I've been wearing New Balance running shoes religiously for years. I wanted to switch to a lighter weight shoe for doing speed work, and decided to give these a try. I ordered my usual 9.5 D (I ALWAYS get this size in NB), and laced them up for a run without paying too much attention to how snug and short they felt. I should have walked around the house before taking these out on the road so that I could have returned them for a half size larger, because these do feel tight on my feet, and are downright uncomfortable for any run longer than about 5 miles. However, they are very light, feel very cushioned, and give a soft-floating ride for the runs I can manage in them. Once I can stomach paying for a second pair in a 10, I will definitely be ordering these again and excited to wear them for some 10K and half-marathon road races this fall.