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I typically have issues with heel lift, but these boots grip my ankle like they're a part of my body. I've never had heel lift issues or toe compaction with these boots, and when I finally wear them out I'll buy this identical pair again.
I wear a UK 10, 4E / EU 45 pair of Brooks Running Shoes. The AKU 46.5 is perfect for me considering I'll be using it at very high altitude. It is reasonably warm, and sufficiently waterproof. Layer up socks accordingly for colder temps.
AKU is perhaps the only boot which doesn't squeeze my toes. Which is probably the most important factor to protect against frost bite.
I would love to see a double boot from AKU for -40 to -50 ° C. I will surely buy it.
Outstanding customer service.
The boots are great. I wear a size UK 10 / 4E width running shoes. UK 11.5 is a good technical fit for me, including accommodating for swelling of feet at altitude.