I bought Monoliths in January ahead of a summer alpine trip. Tried both them and Scarpa Mantas and preferred the Mammuts. Very comfotrable from the off. A high ankle but I was already used to a higher ankle in my 3/4 season Brasher Kanagas. They got their first real test on maybe 3rd or 4th wear doing Ledge Route on Ben Nevis in March. Crampons most definitely required. Combined well with my C1s. Wore them throughout the early part of the year until the snow went and they came back into action with crampons on the Mer de Glace/Aguille du Midi route back in August.
Good choice of boot IMHO. I originally picked up a size 11 from Blacks for £130 but a few days wear around the house indicated I needed the 11.5. By that time Blacks were out of that size so I ended up paying £180 for them but still see that as a bargain.