I noticed vertical cracks in the cuff near the ladders on both boots and quickly got a cuff replacement kit from Scarpa. When I unbolted the cuffs I found this crack in the lower shell.
Attachment 491517
Scarpa is sending me a full replacement pair. I had ~75 days in the Quattros--all of them backcountry days. I use a 255 GFT liner and the stock liner. I switch them out based on the amount of vert, or conditions/ski I'm using.
I'm trying out a sized down Maestrale RS ((25 shell) since that lower is the same as a 26 shell for the Quattro XT) while I wait for the warranty replacement.
One thing about sizing down is that the shorter cuff height of the Maestrale is very noticeable to me. Without being able to measure the Quattro right now, the Maestrale looks ~1.5 cm shorter than the Quattro. I have used the GFT liner in the Maestrale, which helped a little, but the cuff height difference is still noticeable. The fit between the boots feels the same when going a size down, but contrary to a review on SkimoCO they do not ski the same. (To be fair, I think that reviewer was A/B-ing the same mondo size.) I'd say if you decided to go with a sized down Maestrale, the Quattro XT is still better downhill. The Maestrale gains some efficiency uphill with the shorter cuff height and you get a rockered, rubber outsole with a full length bootboard internally. If I had to go with one boot I'd go with the Quattro XT despite the durability issues. However, I think both boots are useful for my specific use case.