The Sonus Fabers look good and probably sound great. But for that $$ they would need to double as an actual house! lol
When I was auditioning tower speakers and wound up with the Paradigm ones I currently have (which were about $2700 back then, so at the very bottom of the so-called "audiophile" range), I spent some time in Lambertville at the Art of Sound.
The owner was supposed to demo some Sonus Faber speakers that were roughly $3K. But first he gave me a tour of the place, which is actually really cool (built into rock along the Delaware river). I'd recommend anybody into A/V stuff check the place out just 'cause it's such a cool building on the inside.
Anyway, during the tour, in the main room of the lower level, he had just set up and tuned a pair of large Sonus Faber tower speakers w/some really good stuff driving them. Can't recall the exact model, but they were somewhere around $50K for the pair, IIRC. I've mentioned this visit elsewhere on this forum.
He was really excited about them and clearly wanted me to listen to them. So I did.
Prior to hearing them, I wouldn't have thought spending that much money on speakers would make a difference to someone with my hearing damage. But they were mind-blowing. The detail was way, way beyond what I thought possible.
He then demoed the ones I was there to hear, but they sounded like total crap in comparison to what I'd just heard. So I had to go away and not listen to music for a couple weeks to unhear the ~50K pair before continuing my speaker shopping.
I figured then, and still do but to a much lesser extent, that there's probably a point of diminishing returns on how much one can spend and how much better a speaker can sound. So... is $750K going to sound that much better than the $50K speakers? Not sure, but I kinda doubt it.
I now believe it will sound lots better. But maybe not quite $700K better than the $50K ones. But I think once you're into the 6 figures with a pair of speakers, you're also paying for the visual impact as well as the amazing aural impact.
I will
not be looking at speakers in the 6 figure range as replacements for my current ones. I haven't set a budget yet, it's early days. But I'll start listening to stuff between $10K and $20K and then if I need to, work my way up a little maybe. Auditioning speakers was a lot of fun the first time. I expect it to be even more fun this time around with a much larger budget in mind. So many options.