I never bought any tweaks why?
There is two reasons...
--First they are costly generally, but also i prefer to create my homemade "tweaks" for listening experiments... i created many... 😊 with success...
--Second and it is the main reason: "tweaks" can hide, from the consciousness of those consumers purchasing these costly "tweaks", the real improving necessary controls work needed over the mechanical, electrical and acoustical embeddings dimensions...
"Tweaks" are exactly like a band-aid plaster on a wound, so useful they can be , they do not replace the disinfectant and the anti-biotic especially if they work...And many work...
Then criticizing all "tweaks" as placebo is idiotic ideology and the sign of someone who has never make any experiments of his own, exactly like the passive consumers believing in these costly tweaks and buying them .. Some works anyway ...
But tweaks do not replace basic acoustic knowledge anymore than upgrading our amplifier for a very costly one will solve basic acoustic or vibrations control...
Then string of successive "upgradings" is often like successive buying string of "tweaks", a lost of money at least a part of it, and if it is not a lost of money , it is a passive consumerist act that HIDE the urgent need of the same necessary work in the controls of mechanical , electrical, and acoustical embeddings dimensions for ANY audio system at ANY price...And no upgrade nor any tweaks can replace the work around the three embeddings control...
«In life there always exist two opposite side, idiots on each side»--Groucho Marx 🤓
«Chicken understand only binary logic, not Q-bit»-- Anonymus farmer