Their newer cases have hefty power supplies. You will find plenty of people using them without any problems (and their old cases too). Using the Structure 208, the only digital module I’ve had issues with was an Audio Damage module, but I’ve read that others had problems even in Doepfer cases.
You can find bad things about almost any case/module combo…there are a lot of factors, including how the rails power up/etc. Noise issues can also come from grounding problems related to your USB powered devices like a qunexus/grid/etc and how they interact with your case, rails, and power.