I wear the Triolet GTX, the (very similar) predecessor to this boot.
I tried on La Sportivas and some other brands before the Triolets. They all felt constrictive, particularly in the toes. These were much more comfortable.
I sized up a bit to avoid beating on my toes when kicking steps, accepting that the boots probably wouldn't be very good on rock as a result. However, when I took them out on the rock, they actually performed very well.
The Triolets also excel in snow and very low-angle ice. I haven't tried them out on steep ice, but they seem like they would be acceptable on easy terrain.
I haven't found any boots that leave me with happy feet after, say, 5,000' of continuous descent with a pack, but that's probably too much to ask for.