The wheels are 35mm deep and for my weight (74kg), they hold up very good. No percievable flex. Braking in the dry is perfect, even better compared to aluminium. I use black prince pads (not the evo's). In the wet, they take longer to shed the water, but braking is sufficient. Whould I use these in the steepest decent in the dry? Yes. In the wet? yes, but i'll be braking a whole lot more. The rims came in on the exact weight as described. Their basalt braking surface is an noticeable improvement, although not ground braking.
Final disclamer. I haven't ridden huge amounts of different carbon wheels, so take this as a single sample experience.