Fascinating. I haven't tried the Mooks but have had Ansuz Ceramics, Diamonds and now DTC pucks in my system. Also tried Stillpoints, including Ultra 6 pucks.
Most if not all seem to do something to shift the tonal balance of the system. Ansuz pucks seem to emphasise the bass when under my Devialets. Under the Totaldac server and DAC it's a different effect although I am not convinced it's neutral.
The most extreme was the Stillpoints Ultra 6 under the Absolare Integrated. At first it turbocharged everything. Then I realised it was fatiguing and there was way too much treble energy (along with everything else). Have gone back to the (Stabilian Quatro) feet that came with the amplifier, not quite as exciting but things seem more balanced.
At present I am experimenting with HRS vibration plates and Nimbus Assembly pucks, well the pucks arrive today. The plates had a great effect of calming everything down and I'm looking forward to seeing what the Nimbus add to the party.
Guillaume