The 70 brakes are epic, in standard form they are far better than updated discs/pads with brembo's on the 50. Probably one of the top three improvements between the two cars in my eyes.
At the Nissan event day everyone commented on how good the brakes were when I took them out.
I always update my brakes on cars but stuck with standard on the 70 and haven't regretted it even on track.