David R.wrote a review of La Sportiva Spantik Mountaineering Boot on May 5, 2017
Familiarity: I've used it several times
Fit: True to size
Just took these on a climb of Mera (6,461m, 21,197') having put about 75 miles on them before I left. The break-in was flawless and they performed extremely well on the two days of glacier travel with Grivel G12 crampons (fitted with the longer bar). Even with a cold 2:130am start, there was never a sense of chill in my feet.
That said, they would be too much boot for anything much lower and not enough for 7000m or above.... but on Mera, they were perfect.