Alright love these shoes, however it did take a bit of time to break in, and they get really hot.
For the fit out of the box they are tight, but in the wrong way for me. I feel that the toe box could have been a bit wider, and the heel should be slightly narrower and tighter too allow for the stretch to come. The rubber is awesome the design of the opening is a step up from my montrail indexes, they are much easier to put on, and now that the toe area has stretched they are quite enjoyable. I do however worry about the heel. It feels like there is empty space that might end up causing the shoe to slip. I have don plenty of heel hooking (even some totally unnecessary heel hooking lol)in them and no trouble what so ever so I am not going to dock it for that. My main complaint was toe box before breaking in though I still have to get my feet in just right, and how ridiculously hot they get. I can live with discomfort because generally it goes away once I start climbing and there is always the knowledge that they just have to be broken in, but the heat I don't like. The shoes are perfect at the gym, but in any whether above 85 they get hot. I climbed a route in them to clean after a buddy of mine had finished his first outdoor route, and I burnt my big toe enough to get a blister setting up to repel after I was done. I thought it was because of the heat out side, which was 114 F at the hottest time of the, however I was at the gym and the air conditioner was off or something and my feet got really hot, nothing unbearable but boy was I glad to get them off at the end of the route. All in all still a good shoe just wish they were perforated in the synthetic material and the tongue was more breathable.

It's not the greatest aggressive bouldering shoe, so don't get it if that's what you are looking for (I wasn't, but I had to use them for it one day when I left my Dragon's at my friends house). They work wonders on slab, and don't make my feet bleed and surge with pain.

Review - great on slab and vertical, pretty mediocre on anything overhanging.

Very stiff shoe, fabric doesn't flex at all making a very powerful shoe.

It excels at hard vertical to slightly over hung routes that require precise edging.

If you size a little larger they would work well for long slab work, or long routes that you need to stand on an edge for a while.

I prefer a more sensitive shoe if there is much smearing involved.

They have hard rubber and don't work the best for hard overhung bouldering.

I would say the lack of sensitivity and the hardness of the rubber that make them excel with precise edging on hard routes...make them junk for bouldering period.

Make sure you get the right tool for the job.

I've been climbing for about a year and a half. The first pair of shoes I had were 5.10 Gambits. I loved them, but since they were my first pair, I took horrible care of them as I had a lot to learn. To keep it brief, I put off buying new shoes because I didn't want to rely on equipment to become a better climber. I finally broke down and got these and wish I would have months ago.
These shoes are incredible. I've owned them for about two months and climbed with them inside and out. First off, this is my first pair of velcro shoes and will never buy lace ups again. This shoe is so snug and fits just right without causing any pain. I can sit in my harness trying to figure out a problem or catch my breath for long periods of time without ever feeling any discomfort from these shoes. When I reach the ground again, they're off in seconds without any struggle.
It goes without saying 5.10's Stealth Onyx rubber is amazingly sticky while retaining its strength. They have a nice, sturdy and comfortable heel for hooking. Toe space is snug but not too tight. The edges are great, I am able to use the smallest of holds where it would be impossible in my old shoes. After I got these shoes, I actually improved quite a bit thanks to the help of these.
I want to keep this brief so you'll read it. I love these shoes and recommend trying them on.

great shoe, i replaced a pair of La Sportiva Nago shoes with these. This shoe is a great shoe for bouldering, it has a good amount of control in the toes and a sticky sole. It does fit VERY small. my toes are curled nicely, but i need to take the shoes off every 10 minutes or so. ill save my sportivas for long days and have these in the gym.