I have to say I'm really happy with these shoes.
They fit my foot prefectly and they stick to anything.
I sized them really small: size 39 - my street shoes are usually 42 1/2.
It's still a workout to get them on and I can't wear them for long periods of time. Great for sport and bouldering.

I love these shoes so far. I only got them a few weeks ago, but what I've seen from them so far is nothing short of awesome. I was a huge cobra fan, and was pretty bummed to find out about them being discontinued. So far, these make up for the cobras, and probably a bit more too. I hope they stretch a tiny bit more though.

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This is a sick shoe. You know you want them.....and you will be glad you did. Bouldering....thin footwork.......gym....steep rock.

Buy them small....they stretch like mad.....full size i'd say so far! I'm a 9 street shoe and 38.5 is borderline too big now.

I actually like the rubber on top....works great for toe hooking and jamming on roof top holds.

This is a great shoe. I am a recent convert to Sportiva, and have been climbing in Miuras for the last few months. I liked them so much, I couldn't bring myself to wear my old slippers which was a pain on single pitch sport days. As many have noted they run big and I actually went 2.5 sizes down from my Miuras. They are definitely tight, but I am counting on a .5sz stretch despite the rubber top.

As for function they are excellent. They are really good for edging and smearing. Not as good as a stiffer lace up, but top notch for a slipper. The small focused toe gets you into small pockets and cracks. If you are looking for a high performance slipper, I don't think you can go wrong here.