I tried Zoom, Mooer, Amplifire, Helix and several plugins (NAM, Mercuriall, TH-U, Tonocracy...).
Enjoyed all of them. Every single one has its good things. Mooer, the profiling feature. Zoom has great effects, they are in the game for so long that they know how effects must sound (also, they are cheap and easy to use). Atomic sounded great and the hardware was high quality (vastly ugly to use, though). Helix LT was the best experience in terms of power, I/Os and user interface (sold it when realized that it affects the guitar signal too much).
Plugins are really good too. TH-U with its supposed Kemper profiles, Tonocracy with very good modelling and gain standardization of captures, Mercuriall is what I find to have the most realistic amp sims I´ve tried, and NAM... well, We all know it.
So, I´m curious about FAS, obviously. But at the same time, I suspect they´re not soooo much better than the competition nowadays, at least not to justify spending so much money and having to deal with a complex UI. Somehow I think I wouldn´t enjoy it enough.
Kemper, yeah. Sometimes thought about a used Stage, that can be had for 900€ every now and then. But... meh, a little dated, I think, and it doesn´t have the I/Os and routing flexibility of others (Helix, QC, FAS) that would allow me to plug my electric and my acoustic in just one unit (as I did with the Helix LT).
Boss GT-1000. Meh. It was full of issues from the beginning and they don´t seem to be interested in updating the unit frequently. Sometimes I think about the GX-100 to go 4cm with my amp. But again, once going to buy something, I´d like it to have better amp sims just in case I need them anytime, or for rehearsals, etc. It also has not solved issues.
QC. I´ve used it for a few minutes with a friends capture. It´s fantastic, but again... it´s a little off for my personal uses. Too small for an all-in-one unit. Too big for a pedalboard unit.
TMP. Not even going to think about it until a couple of years, minimum.
I keep an eye on the AmpX launch.
To sum up, all the top dogs have some detail that I don´t like, so I´m not buying any of them. I´ll wait and see if the next gens suit me better.
Honestly... I find it hard to justify having anything more expensive than a little Zoom unit if you gig with a real amp. My ears are not going to feel much of a difference with "better" delays, reverbs, choruses... not to speak about the ZNR gate, which in the devices I tried is unmatched, IMO.