I have been wearing these shoes on training runs for about three weeks now. The runs typically are from about 4 to 8 miles in length, 4-5 times/week. Before these shoes my shoe of choice was the Adidas Energy Boost 2. When I initially ordered the shoes, I ordered the typical size that I wore in the Boost 2's.  However, when the shoes arrived, I tried them on, and they were way too long and especially too loose in the heel. I have a normal width foot, arch, etc. So, I returned the shoes and ordered a new pair, a half size down.<br />These shoes arrived and at a half size smaller than I normally wear, they fit much closer in style to my Boost 2's. However, they still feel a little loose in the heel and slip when I run up VERY steep hills. Also,  my front toes tend to go numb on me when I do longer than 5 mile runs, this does NOT happen with my Boost 2's.<br />Finally, the cushioning feels like there is more support but it is not as responsive as I had anticipated and on recent runs with the Ultras I have recently experienced foot pain in my heel and in my knee that I have not experienced in over a year.<br />Who knows? it could just be my foot size and shape, but for the difference in price the Boost 2's give me a much more satisfying ride and less painful experience than the Ultras. I really really wanted to like this shoe, especially after I paid 180.00 for it, but I think I am going to stick with what works for me: Boost 2. Maybe someone else with a different foot shape and not as many running injuries that I have experienced will be successful with this model. But, this just wasn't for me..... and I really really wanted the all white pair. sigh.