This is the second shoe I have owned, the first being Evolvs. This is definitely a trade-up. I first bought these shoes for slab climbing in Boulder CO but they perform on Texas limestone, granite, and gym settings equally well. It's not aggressive at all and the heel hooks are pretty weak, but that's really the only negative things I could even think of. This slipper smears on literally everything (I could count on both hands how many times I've blown a foot in these) and has really baller edging. They do stretch big time, so get into literally the smallest one you can squeeze into and it will (eventually) become perfect. I wear street size 8.5-9 and got a 7.5. Literally perfect sizing. Just buy this shoe and you won't regret it. BTW c4 stealth rubber is seriously the best thing for climbing since rope :)
The Moccasyms are an all around great shoe. I've had them for over a year now and I'm still overusing them. The C4 Stealth soles make for a great smearing, edging and durability which is unmatched. The shoes do stretch and form fit after decent use but I wouldn't recommend going down more than a size and a half as you will be hurting for months. I think the heel could be more aggressive and the edging wears down more quickly than I would have liked. My feet are red from the dye leeching after I take them off but it's cosmetic at best. Overall, I would highly recommend them.
I have a very low volume foot so I was worried I wouldn't be able to get the sizing right. I had to size down around 2 sizes, standard for rock climbing. My toes were curled over and I was worried, but after several painful climbs, they broke in beautifully. They arn't hard to slip on and off, which I love. Excellent quality. They stretch A LOT so don't be shy about the fit, go as small as you can.
The edging is great for the first few weeks. Once the shoe stretches and forms to your foot it is the best all day crack and multi-pitch shoe. I love when I get to a plush belay and can just slip my heel out but keep my feet in the shoe. Definitely worth buying a pair and seeing if you like them. Even if they don't work best for your feet there is always a place for them in your climbing pack.
I love these shoes, and I probably don't even have the best shaped foot for them. They're incredibly sensitive, and if you downsize 2 street shoes (like I did), you'll have an incredible bouldering shoe that does everything well except heel hook. They're also very reassuring on trad routes because you can feel every little hold (downsize a bit less, mine kill at belay ledges).My feet are narrow at the back, and wide & flat at the front. The toes on the Moccasyms are very pointed, and so the rand's coming off by my pinky toes (plus it hurts). La Sportiva Cobra may have been a better option in my case, but hey, they're still great and I'm hanging on to them.