In reply to Mr. Lee:
> I don't know anybody who has been happy with the Spantik fit.
Hey! I love my Spantiks. So much so I sold my Nepal Extremes as they weighed the same and the Nepals gave me sore feet. The Spantiks are fine for WI4/5 and alpine routes, so long as it's not too warm. I've worn them to the summit of Peak Lenin and they were good, apart from a short period of cold feet around 3am / -20Cish -on summit day.
As to height guides etc, yes. La Sportiva in particular have form with quite misleading descriptions, going back to the original Baturas (Simone Moro did not wear them to the summit of Everest, as implied, but briefly tested them low down). And "High altitude" can be anything over 4000m in their books, it seems. They also have form with seemingly contradictory product timing, with Nuptse/Spantik/Baruntse all appearing in quick succession and being similar spec'd boots, though quite different in design and construction.
The G2 SM are meant to replace the Spantik, but I have heard mixed reports as to their warmth, though they are lighter and less bulky than Spantiks. I would not risk wearing them above 7000m but they should be fine on all 6000ers.
Nepal EVO might be fine in the Andes, it really depends. Spending a few days repeating one of those hard routes on Huascaran Norte? Maybe not so much. But for so many of the other popular peaks, where you are not camped above 5500m and summit during the day around 6100m, they may well be fine for most people who don't get cold feet in general - and they will be less hot and sweaty on the approach.
As gear improves and becomes relatively cheaper, and the average global mountaineer gets relatively richer, there has been a general 'overkilling' when it comes to gear selection and purchase for popular mountains. In the 1990s big synthetic integral double boots like One Sport/Millet Everest, LS Oly Mons etc, were only seen on big 8000ers. Then they came to Denali by the early 2000s and now in Nepal or India you see people wearing them on easy 6000ers. They don't want to risk their toes, but are ignoring that they are too warm, too bulky and get worn out too fast. But in ignorance, they choose 'safety' over suitability.