QUOTE
In addition to that, I don't like any kind of 'sound enhancers,' but that's just my opinion.
I like any kind of 'sound enhancer' when there are weak speakers (sound emitters in common) and environment, or significant quality losses present in the sound source. (Or something with ears

)
And such sound enhancer's mission is to reduce, mitigate that factors.
I use DFX about year at different places (at work, at home, at friend's). It's nice as 'some kind of sound enhancer'. But I adhere to the position to listen as possible the sound that autor creates. Thus I use settings: for Fidelity - 1, for 3D Surround - 1, for Hyperbass - 1-2, rarely 3. There are some not rare cases when I toggle off the DFX (generally, when in headphones), because composition is mastered with lot of HF or basses, or when adding 3D enhancing causes original panoramic effect evidently violent.
I avoid to use settings more than 1-2, reason see later.
When I want to sound the room by very weak little computer speakers, I set the Dynamic boost to 5-7 and toggle off all other functions - the result is great. But, of course, it is not a "music listening", it's just a sounding the environment.
In DFX since 6.110 the Ambience gives some interesting sound to some compositions, but only for experiment.
I have wondered they wrote about Fidelity function - about his ability to regenerate HF. From what?! It's like SBR? Don't know, but at worst tracks (old 128, for example) it rises all HF distortions they have. In that cases I would like to use HF filtering rather!
And, of course, I like his skins :-)
I'm not a native English speaker, and I'm not sure my essay was clear for all. Excuse me.