I have had a furutech fuse under my previous ARC Ref 110 power amp, and a SR Red 1.6a in my Lampi. I could easily leave without those, though they make a benefit. It is also tough to AB fuses to know exactly if all things are positive. Harlequin for example said Audio Horizons is more organic than SR Red. Now there is SR Black. Another guy who loves Mooks and loved the Audio Horizon told me he prefers the SR Red to the AH now.
The AMR is probably the highest VFM fuse. It is so cheap.
Mook resonators underneath provide something I find that other tweaks, or components, don't provide, including cables. I also like the SMT wings I have demoed, two of them at the side of the speakers, 2 - 3 behind, 1 each on the floor in front of the speaker, and possibly 3 - 4 behind the listener. They are good for focus and soundstage and spaciousness. Just had a session demo with Flyer and Jazzhead though, and briefly with Elberoth
That said it would be interesting to see what a whole fuse loom upgrade brings to the table, instead of one by one, and that will be a cheap upgrade.