I've been wanting this for a long time now. I had a pair of Quantums. I didn't have any issues with the buckles being too bulky for technical climbing. My problem was with the fit. I think they built those boots on a unique last. The heels were really wide, and there was a lot of heel lift and a very sloppy fit overall. Had they been lasted like the Civetta, and fit like the Civetta, they would have been great boots.
There have been a LOT of advances over the past decade with lightweight buckles in alpine touring boots. I don't know why they can't import some of that know-how into the alpine boot arena.