Pedro Gonzalez wrote a review of La Sportiva Karakorum Mountaineering Boot - Men's on November 14, 2013
Familiarity: I've used it several times
Fit: True to size
The Karakorum are great boots. My pair are waterproof and warm, without defects, but I think that are not a mountaineering boots, however works great with crampons (I use it with BD sabre tooth clip) for glacier traveling and moderates slopes, so I prefer use the Karakorum boot for hard hiking in the mountains.
These boots are very comfortables and don't need breaking in period, I used it for fist time in a 40 miles hiking (with glacier and rock paths) and my feet feel great all time.