Didn't work for me...
Let me start by saying I did return these (in 2 sizes).
I wear a 7.5 street size. My La Sportiva Muiras are a size 37. I ordered both a 37, and a 37.5 in the scarpa rockette. I have a wider foot at the toes, nothing ridiculous.
I mostly boulder, often indoors at anywhere from a V2-V7 in plastic land. I prefer a more down turned shoe for overhang problems. I understand the process of wearing in a tight uncomfortable shoe but these were just not right for my foot.
The construction of the shoe looks great, extremely downturned and aggressive - I was excited. However after squeezing them on my feet and wearing them around (both sizes) I still couldn't walk (read - could not put any pressure on my feet, walking was a laughable sight). The 37 would be the right size (same as my muiras), as the heel fit tight, but I think my foot is just too voluminous for this shoe. Perhaps a narrower foot may have a better chance.
I am jealous of those who can wear this shoe - I advise that you try these on if you can find a retailer.