Right away I'll say that I love this shoe and it's my first pick for almost any indoor boulder. It's super snug, the rubber is incredibly grippy, and it's softness lends itself to most volume-centric problems. I climb V7 / 7c / 5.13 ish regularly if that helps to put my opinion in perspective.
SoIll recommends going up half a size but I prefer a really tight fit and went half a size down from my street shoe (US 10.5M) and like the feel of a 10. I also own the Free Range Pro's and find the same size works. It's relatively low volume with a very snug heel and cramped toe area that molds very nicely and shapes to your foot after they get a little warm. I have wider feet and still find these fit very well. The heel even fits really well leaving no space at all so heel hooks feel great.
Toe & Forefoot:
These shoes are super soft. They essentially just have a liner separating you from the rubber and there's no midsole. They flex in every direction and the forefoot rubber itself is hyper flexible as well. I find this helps a ton in trying to feel exact positions on little foot holds and edges while the softness lends to great stickiness on big volumes.
The topside is completely covered in rubber as well which makes these shoes ideal for toe-hooks. They're sticky and soft in all the right ways.
The heel works for me. It has a weird shape compared to other shoes I've used like Drago's and are more similar to the heel of a Solution. What's really different is the extra band of thick rubber on the center of the heel which let's you heel-hook with a lot of pressure when needed. It's strange and I like it. It's the most secure heel I've used so far in a climbing shoe and I haven't found anything as form fitting elsewhere.
This is a great indoor shoe. It thrives in overhung routes and can really lend a lot to big volumes and even tough slabs. It's sensitive, tight where it needs to be, flexible beyond belief and really versatile. Would recommend to anyone looking for a good all-rounder.
These shoes are just the right amount of aggressive and they stick very very well. I was able to climb a 5.11 with no slipping issues on the smallest of holds. All of my shoes are So Ill brand and they keep me coming back! I found the sizing suggestion on the website to be very accurate. They are difficult to get on at first but after one or two climbs they are very comfortable.
These are the absolute best shoes I've worn since I started climbing 4 years ago.