Just to preface this review, I love Adidas UltraBoosts. I own three UB4.0's and I own a pair of UB19's. They are my favorite shoe and I just want more!
As for fit, this shoe will be a little tight at first, especially if you leave the insole in the shoe. I generally wear a 10.5 for all of my shoes, and these were a little uncomfortable at first. Keep wearing them, they loosen a little over time. I actually wear all my UB's without the insole. They're much more comfortable to me, and the design of the UB19 with wrap-around primeknit makes it very comfortable and uniform, similar to a sock.
These shoes have a bit more Boost cushioning on the heel end, and you can definitely feel the difference if you're used to wearing other UB's. Sometimes I like it, sometimes I don't. I haven't gone on a run in these, nor will I, but if I got a pair of Core Blacks or something I could throw around, I'll update this review.
The looks can be a little divisive. I personally love the Legend Consortium colorway, it's navy blue with gold accents, it's not too futuristic looking. They obviously do look and feel taller than other UB's, more geared toward performance than lifestyle. If you're looking for performance, I'd probably recommend going for a dedicated running shoe over these, but they do feel fashion forward for lifestyle. Try them out!