I'm a girl with a relatively wide forefoot and small heel, but with very tapered toes.
I saw in several places to size them 1/2 size down from the Solutions. I did so and found that at first the Futura was insanely painful due to being narrow---but that it was just the length I needed to snug my heel all the way into the cup while just lightly curling my big toe. I then took a hot shower with the shoes on to stretch them horizontally, which got me about 1/3 size stretch. Now they are quite comfortable without being sloppy, and I think they will stretch a little more yet.
If you don't size them tight enough, as other reviewers have said, you'll lose a lot of performance. You need to pick the size that has NO extra space along the line from big toe to heel. Unless you have very very wide feet, the shoe will stretch in width (seriously, try the hot shower) to accommodate you.
Second, climbing in them:
I read a lot of conflicting reports about these shoes before I bought them, which is one reason why I wanted to share my experience.
If you like barefoot-like sensitive shoes and feeling the holds under your feet (I do), and you maybe tend to use your foot/calf muscles to grip your shoe onto a hold, the Futuras are a game changer. You have to focus on the corner of your big toe instead of your forefoot, and you have to be somewhat precise in placing your feet; but your reward will be feeling incredibly secure and connected to the rock, since you'll be able to feel that you're putting your weight directly on the hold and even on which feature of the hold, instead of on a rubber edge cantilevered on the hold. Plus the midsole does you one better than barefoot and connects the power of your whole foot to the toe (rather than relying on your toe muscle alone). For me, the No Edge definitely worked as advertised right out of the box, and I'm completely sold.
If you prefer an edging shoe with a lot more support and/or your style is more to press a sharp edge or a stiff toe harder onto a hold to gain more security, the Futuras will probably not suit you. (But that doesn't mean you can't benefit from learning to climb Futura-style.)
The shoes excel at vertical and overhanging climbing especially on weird footholds that edging shoes roll off of. I would find them suboptimal for climbs with a lot of narrow cracks or tiny pockets that you want to shove a sharp edge or pointy toe into. They are also too aggressively downturned to be good slab shoes. I also would never use these for crack climbing shoes.... I found that they toe and heel hooked well, though not as well as the Solutions, but that I enjoyed the increased sensitivity.
Overall, I think the biggest issue I have with the Futuras is that they might cost me a lot of money: they're so amazing I just want to climb everything in them and wear them out faster while letting all the other expensive shoes I own gather dust...