I bought my first combo pack without knowing what it trully is. Was really happy I could power my all 3 pedals at the time, no questions asked.. At some point I got a used digitech pds 20/20, and when it arrived at my place I was terrified, I had to find a way to power it.. Truetone combo was there for me though!!
Now, almost a year later, and many pedals later, I got another one. If Nathan Latona from Tera Melos can power his 2 boards with just these, it will work for me as well! Yeah, no isolated outputs or anything, but who cares? :) If there's any noise, its not the power supply's fault. It's the pedals fault, or it's not a fault at all.. Learn to love it.