Glad I was able to provide some insights. Even before covid it was hard to be able to audition stuff, and of course it has only gotten worse. Sometimes reading and forums are about the only research you can do!
I sit pretty far field from the Aeris - 12-13 feet away and my back is against a wall, so my actual listening field isn't fantastic. I'm in a large 15 x 30 room that has a peaked ceiling and is open on either end - imagine a "Z" with the top and bottom being open to other rooms and the middle being the actual listening room. Anyways, even with all of that, I get a nice deep soundstage. I wouldn't say that the width of it is anything crazy - Roger Waters "Amused to Death" is still a couple of feet within the speakers - but the depth is good. By the way, even with all of that air space, the Aeris can pressurize the room as much as you want them too and do it without straining.
Character is hard to describe, so let me try to tackle that question a different way. I think the strengths of the Aeris are: dynamics, cohesiveness, flexibility, PRaT. They are not wallflower speakers like some brands tend to be.
I'm not sure what you enjoy listening to the most. I am all over the board myself - I'm listening to Pantera right now, and yesterday I was enjoying Hugh Masekela. I think I am trying to say that if you really like chamber music, single guitar stuff, or ethereal music, I don't know if the Aeris or Tekton would be my top choice. Otherwise, if you tend to enjoy turning it up a little louder on the good songs, and you want to tap your foot, the Aeris might be for you.
I don't think the Wavelet is mandatory, but the on-the-fly flexibility is pretty awesome. The room correction works as advertised, and the room is the biggest contributor to sound. You can toggle it on and off to hear the difference and once you hear the corrected version, its eye opening. I don't think I would go back to running them without it.
Like all great speakers, every time I have upgraded something in front of them, they have gotten better. Amps, source, cables, vibration control, electric outlets - all of those upgrades were noticeable.
I've had B&W 802 Nautilus, Infinity IRS Betas, Genesis 500s, Lawrence Audio Violins, McIntosh XRT28s, and now these, and I've gotten to listen to a bunch of others along the way (Magico, Wilson, Burmester, Eggleston, Rockport, Tidal, Kharma, etc.) and I think the Aeris are the most well rounded of the bunch for what I listen to and how I listen. Of course I am biased, but there's probably a reason not too many of them pop up used :)
As you've probably read, it's a good idea to get two subs rather than one, regardless of how well it performs. They will load the room better and help fill nulls. I'm sure some lucky person will be glad to snap up your Brisance as you evolve the system.
Good luck with the decision!