The noise for Codes can be multiple things: If you're on RS fork, having Torque caps help a lot in stabilizing the wheel. The classic SRAM Centerline disc, in 200 and 220mm is quite flexy as well, after all, their new one is thicker, but still nowhere near as thick as the competition nowadays (like TRP disc). Hence, the front brake in particular can get noisy, esp. under heavier/stronger rider who flexes the front a lot.
Then there are pads who retain the power of sintered, but accoustics of organic, like Trickstuff Power. But boy, are they gone in a whim :- D You go on two rides and they're gone... but they're damn powerful and silent.
After paying few times for them I went back to full-metallic again.. noisy but no need to replace every week.
But these are ultimately still a great brakes. They're at top tier of power (below Magura, Trickstuff, etc... but on par with Shimano, Hayes..and of course, lot more than Hope), very nice modulation, pretty easy service, good parts availability at every bike shop (and bike centre/park).
And SRAM brakes are now specced on 90perc. of all bikes from factory. Of course you'll hear about their troubles lot more (and damn, I remember having the sticky piston with 3 pairs of Guide brakes few years ago, such a shitty design). The reviews don't (all) lie/sugarcoat, reviewers and pros are universally very fond of Codes. And difference between R & RSC is just matter of smoothness (due to bearing) and bit more modulation. Same power though.