Mark,
I am pretty sure you are right.
I have had the Dezorel plugged into my system all weekend. While I still need to do some more testing to be sure of my results, my first impressions are that coupled together with the Bolder Quantum power strip the Dezorel adds nothing, or at least nothing worth noting. It should be noted however that I experienced no AC power problems all weekend like I typically have. I even ran the dishwasher with the system still on (while doing work around the house) which usually causes me major problems even with the bolder power strip. No problems were experienced. Did the Dezorel lower the noise floor? Couldn't tell but maybe its benefit is more in the random AC problems rather than the common mode noise. Who knows, will need to do more testing before I sign off on a ranking. Tax season has slowed my evals down a bit.