I am in the same boat, I've been using an ATS of one form or another for 18 months now and have never seen nutrient destabilization. I guess I could see this happening if one were to deep clean the ATS every time, with with an ATS that has good light, just a little left over algae starts growing immediately.
As for noise, I can only guess that poorly designed units do that. THe surf series from Santa Monica needs an air pump, so if you get a noisy air pump thats on you.
I now have a rain 8, it does take a little longer to clean, but its a waterfall type. The only noise I ever get from it is when my ATO is empty, I turn off the pump, and then forget to refill it for 3ish days. The water level in my sump drops, and the water falling out from the ATS does make noise.... That seems to be a user error