I am new to climbing so take this with a grain of salt. My street shoes are 10 1/2. I ordered a size 12. I should have ordered a 12 1/2. Without socks these are tight and my toes are arched. I have worn them for 3 climbing sessions but my feet start killing me after an hour of climbing and I need to take them off for a 10 or 15 minutes to give my toes a break.
They seem to work better than the rentals for climbing though and I like the fit of my foot in the shoes except for the toes. Another half size up and I think I would have been fine, still tight with the toes slightly arched.

This is my first climbing shoes

I wear a women's size 9 and that's what size I ordered these in men for them to fit well, other than that love this shoe

These run about 2 full sizes small I am a 9.5 street shoe I bought a 9.5 and 10.5 and had to return both way to much cramming in the 9.5 maybe an 11 will do but i ended up going with la sportiva tarantulace which I bought in store at rei cause I was fed up with buying and returning shoes lol . The la sportiva run on point with sizing. I will most like still buy a pair of endeavors though when I find my size in store I like the hemp lining and velcro feels like a very solid shoe.

I am a beginner climbers. I purchased about 4 pairs of shoes before finally finding these. I absolutely love the feel of these. I have a narrow foot and the biggest issue I was having was that most shoes are loose on the sides even when my toes are in pain. These are snug all the way around. My toes are curled, sides are tight, and they are comfortable. Initial climbs I had issues with how slick the bottoms were, but that lasted about 1 afternoon climbing. The next time it was super sticky and no issues at all.