I got an Alpina Tibet in 2012 and since then have done over 100 high mountain tours with them. A year ago I was seduced by marketing and bought Mammut Ayako, much more expensive than a Tibet. Mammut boots after less than a year of use are trash - sole hard as stone and slippery, seams loose, shoe shrank and became too small. That year I used Alpina Tibet for field and forest work, this year again for high mountains. Shoe condition from the photo.
I also have Alpina Teton bought in 2001(!), over 200 winter tours so far. Like new, won't sell for 300 EUR though new cost 100 EUR then

Anyway - after short Mammut delusion back to Alpina which offers most for the money.