Done one ride, maybe 10 miles due to being busy, else either being very cold or very very very wet and muddy.
They do what they are supposed to do i.e. they stop me - so as good as any other disc brakes I have - not had any of the problems like pads dragging or having to rebleed after each ride, ok, after one ride - lever still is firm. I did trim the hoses and as usual with this type of brake, it tool a long time but no probs once done.
The only minor criticism I have is the brake lever isn't quite in the ideal position for me - I think that is because the lever pivot is too close to the bar so the angle of the lever is slightlty wrong for me.
I think I'll be replacing by formula R1 that arrived in post this monring, since those work out 50 g lighter, the lever is better positioned and they will allow my rockshox x-loc to sit nearer the grips - downside is I will not be able to use my lovely Hope SAW discs due to clearance between calliper and the hollow rivet.
overall verdict is
(note these are the latest model - the problems you read about are for the earlier models - the difference is the posiiton of the bleed screw on the lever and callipers not needed CPS washers)