Just got these in the mail yesterday, so I'll update my review as these babies break in...

Right away I was struck by the sharpness and precision these shoes offer, even from a visual standpoint. This is my first pair of five ten shoes and I'm happy to see they've left out all the frills in exchange for more thrills. I bought this at my street shoe size (8.5) and could juuust squeeze my foot in. I have a wide toe box and these are a narrow shoe, but my toe barely makes solid contact with the point while my heel is in filling the heel cup, so I don't dare size up. As these have a full-leather upper, I'm hoping they will stretch to accomodate my flipper-shaped feet. The slipper design is easy to get out of but feels secure, and the single velcro strap instills a little confidence that I won't pop out of the shoe during a heel hook or similar maneuver.

Very excited to get climbing in these and try out the Stealth rubber. I've only worn La Sportiva until now.

EDIT: After a day of bouldering I've decided it isn't worth it for me to wait and see if these shoes will break in to fit my wide toe box. They're simply too narrow while fitting me perfectly length-wise.

I was, however, really psyched by the sensitivity of these shoes. On tiny, slippery holds my old Miuras lacked said sensitivity and I would often slip or miss the toehold entirely. These shoes made me feel much more precise and solid, even though I was in serious pain for most of the session. I'll be searching for a similar shoe with a wider toe box in the future.

Happy trails!

Dont buy it
The shoe is great for about 2 months then the rubber wears down and they need to be resoled.
Resoles are not available in 2mm rubber, so you lose all the sensitivity of the shoe.
After resoling its really just not worth climbing in.
if you have $100 for shoes every 2 months they're great.

You can literally roll them up and put them in your pocket.

A lot of reviews say these run tight, but I disagree. I wear a UK 40.5 Miura and the US 9.5 Project is aaaalmost too big. I expect it to be too big once all that leather break's in. These shoes have ZERO last in the sole. Again, there is no last, so my suspicion is that they will stretch a lot. The fit, as I go into week #2 with these kicks, is maybe a little big on a low-volume foot, but the velcro does help a little. Not a lot, but a little.

Without any mid-sole last, it's almost like a sock with rubber on it. You can feel the slightest nuances in every hold you put your foot on. Though, when it comes to standing vertically on a crystal or a screw-on, it's going to be all on you and your toes. Very little energy gets passed into the stability of the shoe.

The Five Ten rubber is good as always. All in all, not a bad shoe, but certainly worth checking out in the flesh first.

I have had these for almost two weeks now, and I love them. during my first few bouldering sessions I could only have them on for about 20 minutes at a time because it felt like my toes were so smashed (despite ordering one full size ABOVE my street size). But now, after wearing them for 5 or 6 sessions at the climbing gym (probably bouldered about 15 routes, used them on the big wall 9 or 10 times), they are almost completely conformed to my feet. I can wear these for hours at a time now, and switch between these as my new Prisms on the big wall.

One concern I had when purchasing these was that they would be almost TOO sensitive... I am newbie climber, and everyone else seems to think that these are for hardcore climbers who have been at it for years. Well, I disagree. Using these right off the bat as I get into climbing has quickly taught me what works and what doesn't, how foot placement should work, and where exactly the holds are when I am not looking down. In short, they have helped improve my climbing, not been an obstacle. GET THEM! But order up... I am 9 1/2 street, and had to get these in 10 1/2.

Just received these in the mail yesterday. My buddy has had these for a few months and loves them (though he says they can get a bit painful on long big wall routes). I have used them for one session at the climbing gym, both bouldering and big wall. Thus far, I am enjoying them.

A little about sizing: I haven't quite figured out 5.10's sizing regulations... allow me to elaborate. My buddy owns a year old pair of 5.10 Piton's, size 8 1/2. They are broken in, and fit me perfectly. My street size is usually 9 - 9 1/2. My buddy's pair of Project's fit only slightly more snug than his Piton's... only the Projects are size 10 1/2. So I went ahead and ordered a 10 1/2 for my pair, which will fit perfectly after a couple weeks, I am thinking. To further complicate things, I also just purchased a pair of 5.10 Prisms, size 9 1/2...which happen to fit almost exactly as snugly as my new Projects in size 10 1/2 and as my buddies broken-in Pitons.

Anyways, I don't have much time on them yet, but loving them so far!

Food for thought!

this shoe works great with the original rubber but once i resoled them with thicker rubber i couldnt feel a thing and they didnt hold to the footholds so well

I am completely loving these shoes. The rubber is super sticky and they are aggressive enough to do really technical moves, yet somehow not killer on the feet. They're so easy to get on and off between climbs as well that you'll love using them.

These shoes definitely live up to their reputation, they grip like crazy and are the most sensitive shoe possible. However, the rubber on most shoes is twice as thick, so that although they are twice as sensitive, they also wear out twice as fast. So, in terms of performance they are great, if you have the money to replace them often.

Typically in Sportivas, I have a slightly narrow foot and have not had much luck fitting Five-tens, but am loving my new Projects. Not only do I have a snug fit throughout the shoe (street shoe 9 = project 9), its super sensitive sole is IT for thin problems. Quickly became my go-to for Bouldering and steep Sport routes.

I love these shoes! They are my favorite to climb in for hard bouldering routes and work best for overhanging toughies. I mostly climb in the gym, but have climbed with them outdoors as well. They are equally effective in either arena. They are super sensetive, so I always trust my feet because I can feel holds so well. After a while, they fit like a glove and wrap around your feet. The downturned last also provide lots of power as long as the shoe is sized properly. That being said, there are some specifics that need to be noted. These shoes stretch more than any shoe I've ever used. I wear a 10 in street shoe, 9 in most climbing (anasazi, mocassym) and bought these in an 8. They have stretched one size so far and I think they will stretch a bit more. I could have gone down to a 7.5 with the amount of stretch in these shoes. Keep that in mind when sizing. There will be pain at first, but it's well worth it. The shoes are so soft that it goes away quickly. This also means that relatively strong feet are required. Their softness means less support and more strength required from your feet. All in all, with the proper sizing and use, these shoes are like climbing barefoot if your feet were hands! Highly recommended!

I usually wear La Sportiva and thought I'd give these a try. My street size shoe is a 12, and my climbing shoes are a 9 or 9.5 (42, 42.5) so I got these in a 9.5 and I could not even think to squeeze my foot into the shoe. I would need to get at least a full size bigger