My FIL had an AS. He went from a 17' jayco to a 24' early slide model Kit to the AS Excella. The AS had a leak, that didn't ever show for years, but manifested itself in a smell that was more akin to spilled brake fluid or something rather than the usual moldy smell. Taking apart the front dinette was what lead to the leak, which never was visible from outside.
It was heavy, much heavier than the Kit, which prompted him to lose $10K on replacing the truck with basically the same one with a 6L engine, which costs him $$$$ in daily driving fuel today.
The AS was never worth all the hype. He rarely used it. The shower door fell off, the automotive style headliner began to sag (Just like a GMC motorhome) and lots of little things, plus the upkeep on the skin was a chore, and there was $#!+ for storage. It was dingy, dark, and cramped.
The traditional 24' Kit TT was the best he had. I used the Kit a few times before I got out of my popup. Loved it.
I have gone through a popup, a GMC motorhome, and now have my 2010 Nomad Smooth side TT, without a slide. The GMC was fraught with automotive issues, and the curved walls, like the AS made interior space cramped. My Nomad is the best of the three.
If you want comfort, ease of use, and space, I'd stick with the TT that you have that SHE likes, and mod it to your content. (I heavily modded mine).
If prestige rolling down the road is what you want, buy the AS and deal with a *****y wife and a cramped heavy trailer.
Ifyou really want an AS, go hang out in one for a few hours or rent one. You will probably end up keeping your TT.
My 2 cents.