I'm running a powermax (eventide branded dc7) my board is surprisingly quiet with 17 devices being powered. Been recording and thought any noise issues would stand out more obviously, but it still seems pretty quiet (surprisingly) I would like to get an expansion but at this point it would be more for cleaning up the mess that daisy chaining so much from one supply creates. The one noise pest I seem to have is my airstep, it's sharing power with eq2 and POG (pog could be the other reason there's noise, but it seems to get along with the eq2) and when it's connected I get some wierd clock noise that goes away when I disconnect the power plug and run off of the battery (could be charging noise I'm hearing as the airstep is geared more for charging and playing remotely), so I guess that's the one spot I'd need isolation. The only other things that could cause problems is the tuner (audio signal plus display usually causes issues when sharing power I have found) and my zio (analog) those 2 items are isolated, though I think the Zio could probably share power selectively with one of the other one series pedals, but I didn't want to chance it. That leaves 4 taps for everything else (vertigo and ventris on one, nemesis and collider on another, la lady, ultrawave, and Gemini on another, soleman, 2 hubs, reflex and c4 on the last). All of this eats up just over half of the available current of the powermax, which means there almost enough juice to power this setup a second time yet.
I have a couple of the older generation power supplies, and they're heavier, have a quarter of the available power of the dc7/powermax, and are more selective in how you hook up things (different power ratings and voltages on the taps, vs 660ma per tap), it was always a lot more thinking involved setting up my board with those supplies than with the powermax.