Yes, the X-link outputs are unfiltered and not isolated from EACH OTHER. They share a total of 2.0A of current running at 12V. But they are isolated from the other 12 “regular” outputs on the PP3+, which are all isolated individually. And the idea is to plug the QC into ONE of the two X-link ports and leave the other one unused, effectively creating an isolated output for the QC, drawing up to 2.0A. I’ve been running the QC this way live for 6 months, with no glitches and no hum or crossover noise at all.
Agreed that the ports on the DC7 can draw more (660mA to 500mA) and the unit is thinner (1” to 1.38”). If those two differences are vital to your rig, then go with CIOKS. However if not, the value I see is that the PP3+ and the CIOKS DC7 have the same MAP but you then have to purchase the CRUX if you want the simplest QC power solution with the DC7. If you choose to go without the extra cost of the CRUX (USD $90 MAP), you have to sum the 2.0A using FOUR 500mA outputs and three doubler cables on the DC7. Since the DC7 only has 7 outputs, you’ll be leaving yourself only 3 free outputs. The simple one cable connection from the PP3+ to the QC leaves ALL TWELVE isolated outputs available (Ten 9V 500mA, and two switchable from 9V 200mA or 12V 500mA).