Extremely comfortable and functioned excellent on the mountain.
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I recently got these for a friend and this is what he had to say about them!
"Got the new scarpa phantom techs and love the sleek compact form for hiking. The zipper relieves the pressure I usually feel in my upper foot which is a plus. The rubber seems pretty durable but I've heard that it can break down without crampons, we'll see!

Boot fit is everything and these fit my foot perfectly. They are decently warm, definitely warmer than a single leather boot but not nearly as warm as a true high altitude double boot.
Unfortunately the sole is about as fragile as everyone says. The soft orange stuff in the middle is fine, as ice boots don't wear much there even with trail use. Unfortunately, the black rubber doesn't appear to be the normal vibram sole as it likes to crack and break off in big chunks with just a little bit of trail or rock scrambling use. Clearly the more foamy black rubber is to save weight, but the sacrifice in durability isn't worth it. I'd highly suggest that scarpa use a harder, more durable rubber, especially right at the toe. The attached photo shows the toe of the boot after 8 miles total of dry ground use and all other use on ice/snow. I'm adding shoe goo to the toe after every use to desperately make these last as long as possible.

A nice upgrade from Phantom Guide except for us wide foot soles. With Scarpa going to a narrower last, what is left to fit our widest?

I was looking for a good pair of mountaineering / ice climbing boots, stiff, comfortable, warm and yes also nice looking and not too bulky! Well, the short answer is that boot does not exist unfortunately and as most things, you always end up with a compromise. And this boot is no exception!
And here is the long answer:

When I bought this boot my main concern was fit and if was able to keep my feet warm in very cold temperature. I climb/ hike in the white mountains and in winter there it can be subzero! Friends of mine warned me that boots are probably the most important (and expensive !) piece of gear of your system!

I usually wear 9.5 even 10 in some shoes ( my hiking boots are 10. (I am 5.8) I bought a 9.5 hoping that the fit was not too snug. I usually wear thick hiking socks (maybe a silk liner underneath). They felt snug but right. Kicked some ice and my toes seemed fine! My feet are on the wide side and the boot accommodate them nicely. Because of the investment I wanted to test them in real ground so I went hiking in the snow with crampons for 6 hours, up and down a mountain. They are indeed pretty comfortable to hike in them, a little rigid on the ankle although they advertise the opposite, but I can see myself using these for mountaineering as well. They are not too warm. Hiking up in deep snow, up to my knees, I felt ny toes getting a bit cold. Temperature was 10 degrees f.
The in build gaiters are great, Wearing only a pair of soft shell pants and no external gaiters in deep snow i was more than fine: my feet and ankles stayed dry all day. The spiral zip is kind of annoying and you wonder if it has any functional significance beside being cool. As I mentioned it does not help your movement and sometimes it is not easy to zip all the way.
Next week I will try it in vertical ice, and update this review. Hope this helps!

Going back to the beginning, this boot is perfect for lower elevations ice climbing and mountaineering: solid boot, hands down. However I don t think is that warm, perhaps it can give a few more degrees than others and the outer gaiter protect from wind and snow but eventually your feet are going to get cold. So, you have to go to a double boot and that point...

"Boots are great. God them half size above my street shoe and that seems to be optimal for both circulation and close fit. They are more agile on rock than one would expect and extremely warm. Unzipping the Gaiters almost all the way and lacing them loosely makes them fairly comfortable for approaches and walking and more level terrain. Excellent fit for my petzl crampons too. I wish I would have had more chance to use them this winter. They did fine on a mixed snow climb up little bear, a rather "thoughtful" class IV climb among the Colorado 14ers...the conditions were fairly marginal for safe climbing yet the boots handled like a champ while my ice axe was struggliing to find some purchase in some very sugary snow on a slope that didn't allow for any margin of error."
He was so stoked on these shoe he sent me that review!

By all accounts an amazing boot for use with crampons (ice, mixed climbing, etc...). Be forewarned that there are numerous accounts on the usual forums regarding astoundingly fast wear on the soles - on the order of ~10 days to be completely worn.

If you're planning on using them with crampons they should be great, but if you do any amount of travel on rock be very wary (scarpa rejected replacement stating they were "meant for use with crampons").

I have been trying to find a good pair of boots for the last year with not much luck until now. I worked my way through the competition and have found nothing compares. Over the last three days, I have climbed about 30 pitches in New Hampshire. They are amazingly light, fit like a glove, plenty warm, stay tight all day and so much more. While these are generally considered ice climbing boots, if your looking for a stiff mountaineering boot,this will do the trick. I had one free day and did mount Washington and the boots worked great for that too. Lots of snow due the recent weather and they performed great. Overall, if your looking for a single boot design ice and mountaineering boot...these rock.

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Spent a few days testing these out at the Ouray Ice Park last winter. Super comfortable and warm. Great flex when walking, but sole is stiff enough for mixed and ice. Zipped gaiter is a great feature. Favorite mountaineering boot from Scarpa thus far. True to size in my experience.