I bought these after as a follow on to my vapors. Being that they are more aggressive I went a half size up from 10.5 to 11. My vapors were super small so they hurt to break in so I suspected these to be the same. To my surprise they aren’t nearly as uncomfortable. The first time I tried the on in the gym I was a little suspicious they felt big and baggy and they didn’t feel as snug on my foot. It also seemed like there was a lot of material on top that just was in excess. However, they feel very good on the wall. Indoors I feel like if I put my toe on something it just is trustworthy and outdoors I feel like they do a great job bending and shaping to tiny toe chips. It just feels like I can get more rubber in contact with the rock due to the soft soles. The rubber on top is kind of nice too, providing extra traction when jamming. I can’t really speak to the durability yet since I’ve had them for only about 10 weeks. However, I climb usually 5-6 times per week for about 3-4 hours per session. Usually one of those is outdoors. So far they are holding up okay.

These shoes have been by far my favorite climbing shoes. they are also by far the softest shoes I have climbed in (much softer than solutions), if you are looking for a soft pair of shoes these are for you. Also the rubber on them is by far the grippiest rubber I have experienced on a shoe. You can feel every little detail on holds. I mainly used these for gym climbing and like I said they were great for everything from lead, to super overhung boulder and even slab surprisingly. As for fitment I wear a size 11 in street shoes and a 42 in solutions but for theses I had to go up to a 43. I originally tried these in a 42 but was BARELY able to get my foot in the shoe.
The only downside to this shoe was that I put large holes in both of them in 3 months of use. Take that with a grain of salt though, I climb 5 days a week for at least 2 hours so with a softer than soft shoe this is expected.
Overall these are a kick ass shoe, but be prepared to go through them quick if you climb hard and a lot. I am trying the Scarpa Furia Air next so I am interested to see how they compare.

These are currently my go to gym shoe and they are great. They were pretty painful to put on and take off when i first got them, but they broke in by the time i was done with my first session.

Sizing:
I usually climb in the scarpa instinct line of shoes (VS and VSR) and the I have my Furia S in the same size as my instincts.

Pros:
They are really sensitive and allow me to feel the footholds under my toes; great for getting that precise toe placement. The shoes are really soft and work work great smearing on volumes. I was worried about the shoes getting chewed up quickly, but my feet feel more secure and slip less which, so far, has kept the shoes edge and toe area from wearing down too quickly.

Cons:
Personally, the heel doesn't fit me well and pops out if the heel hook isn't loaded in a particular angle. The heel on the Instincts feels more secure. (The best heel for me has been the women's instinct vs). If you don't have strong feet, its likely that your feet will get tired pretty quickly.

I added the Furias s to my rotation of bouldering shoes about 4 months ago. They are as advertised, down turned, soft, sticky and sensitive.

Pros:

1. rubber is the stickiest I've ever felt on a climbing shoe.

2. Because the shoe is so soft I can feel a hold and can be very accurate with my foot placement. I can flex my feet and turn my feet in angles that a stiff shoe would not allow. This translates very well to smearing and outdoor climbing.

3. The top of the shoe is almost completely covered in rubber, making them great for maximal traction in toe hooks.

Cons:

1. my biggest gripe is durability. Durability is sacrificed for sensitivity. The rubber is thin and wears rather quickly.

2. I have a narrow to medium width foot and this shoe is a bit wide for me and there is slack on the top of the shoe. This can be a big problem when I have to pull really hard on a toe hook and I feel the top of my shoe moving.

In closing, if you have a strong foot and a fat wallet, this is a must add to your bouldering shoe quiver.

Sizing: I downsized 1/2 size from my street shoe.

I don't understand why Scarpa decided not to place XS Grip heel rubber over the Internal Power RIb. Personally, I'll be sticking with the Drago and Chimera as my two boot soft shoe quiver. Regardless, even if there were proper heel rubber on the Furia S, I would still opt for the other two models. See photo of an early iteration that Scarpa did NOT go with and compare it to heel depicted in the product images.

In reply to Matt's comment below, I contacted Scarpa about why the Internal Power Rib was not sticky rubber and the rep stated I was correct, and in his opinion was a design flaw. If you notice on the new Booster's that the internal heel piece is M50 rubber, which is super sticky and textured. The Internal Power Rib on the Furia S is not sticky rubber. And yes, I was able to try the shoe. One does not need to get bent by a negative review if your opinion is different. All reviews should be taken with a grain of salt. In my opinion, the different colored Internal Power Rib was simply a marketing gimmick and that the other shoes in their lineup are much better options.