I bought these shoes a few months ago and have used it mostly in the gym whilst bouldering, but also whilst sport climbing. These shoes took a week or so to break in, but fit like a glove on my feet and feel like a sock. I've gone 1 size down from my street shoes, and quite honestly, I don't feel like I needed to go any lower. In fact, I wonder if going 1/2 a size down would've sufficed.
Pros: Incredibly comfortable once broken in and the more I use them, the more sensitive they start to feel, which, for me at least, makes climbing in them an absolute joy. They're pretty decent at edging too. Heel hooks and toe-hooks always feel very secure.
Cons: I haven't climbed on rock with these just yet, but I'm not sure I trust the thing strap to not fail if rubbed a lot along sharp rocks. Of course, the chances of this happening for most climbers is pretty minimal, but might be worth noting. I'm also not sure if it's just my technique or if the rubber on this shoe isn't as amazing at smearing as some of the shoes I've tried with the XS Grip/Edge rubber. Don't get me wrong, it's does a pretty good job and it is not far off from those other shoes I mentioned, but sometimes I don't fully trust them when a volume is a bit too steep.
All in all, I'd happily buy this shoe over and over again. Super happy with it.