After having such a good experience with the Salewa Rapace GTX Boot, I bought this boot as a lighter alternative for summer alpine forays. To date these boots have seen about 70 miles and over 20,000 feet of elevation gain. All 70 of these miles have been comfortable and blister free with great, customizable ankle support. I use these boots for when I'm wanting more support than what an approach shoe provides, mainly rocky or steep scree terrain or with a heavy pack where I want to protect my ankles

SIZING / FIT:
True to size. My street shoe size is mainly 6.5, and the the 6.5 Salewa Mountain Trainer fits like a dream. No heel slippage or toe bang, plenty of ankle support.

PROS:
* Comfortable - whether it's 15 miles and 7,500 feet of elevation gain in a day or several days in a row with weight on my back, so long as my feet are in these shoes, I've not experienced any discomfort, much less any hot spots or blisters.
* Flexible yet very supportive - the feel of this boot isn't too far from wearing sneakers, yet provides enough support through the sole of the shoe and for the ankles. The lacing can be customized and these boots have saved me multiple times from rolling my ankle.
* Waterproof - I can cross streams and creeks with abandon! (So long as the water doesn't rise above the top of these boots.)

CONS:
* Stickiness of sole - these soles are sticky enough and I've done some exposed Class 3 confidently in these boots, but the boots would be even more versatile with something as sticky as Five Ten rubber!

I love this shoe! Used it for the first time this weekend on a short hike (7.5 miles) over varied terrain (Class 1 dirt trails, Class 1/2 steepish but easy cross country, Class 2/3 ridge scrambling, and a stream crossing), and they remained comfortable and supportive for the entire time. I bought these to replace my 5.10 Camp Fours on longer dayhikes/approaches and hikes that involve a lot of snow, as I've rolled my ankle the last couple of times out and they aren't waterproof. Here's my synopsis:

SIZING / FIT:
True to size. My street shoe size is mainly 6.5, I tried these on in 6.5 and 7.0 and went with the 6.5, and they fit like a glove. No heel slippage and no toe bang. Very minor hot spots on the outside edge of my little toe, but I was only wearing one pair of socks and my feet trend on the wider side. Additionally, there is a variable footbed, so the shoe can be customized based on your sock system (same comfort level with light and medium hiking socks and heavy mountaineering socks with liner).

PROS:
* Comfortable - they really fit like a glove.
* Light - not much heavier than my Camp Fours (subjectively, anyway)
* Very supportive - the sole is stiff and provided a different experience from the Camp Fours, not as flexible, but definitely more support. Also, I'll have to try to roll my ankle in these.
* Sticky sole – not as sticky as the Camp Four, but definitely sticky enough and definitely confidence inspiring
* Great edging – the boot is stiff, so the edging is definitely better than with the Camp Four
* Waterproof - I forewent a bridge and walked through a shallow stream to test how waterproof these shoes are, the stream was short (~15 feet), but my boots were submerged as far as possible before water would start entering over the top, and my feet stayed dry. And the outer part of the shoe must be treated as well, because they dried immediately.

CONS:
* Durability, maybe – I put a 2mm shallow divot into the leather on the left toe while scrambling. During my creek crossing, I could feel the temperature of the water in that area and that was the only part of the boot that did not repel water/dry immediately. Instead, the leather absorbed and held water. Not sure if it was due to the nick I put in the leather. This said, my feet stayed dry.

REMAINS TO BE SEEN:
* Insulation
* Snow travel with and without crampons

I've been wearing these in freezing temps (nothing colder than -3C) without socks, and they've kept my feet toasty! I ordered my usual size, and agree with the reviewer who said they are kind of tight enough around the calves - they're tight enough that I can't comfortably tuck my jeans in, and I don't think I could wear heavyweight socks with these without a serious squeeze. In any case, definitely a cute, warm boot.