These are certainly an endgame speakers. Going bigger in the classic line brings more reach in the low end suitable for biggeer rooms. I'm perfectly happy with 50ASL's in my 4,75 x 7,1 x 2,6m living room + open concept kitchen space. Measured from the sweet spot, they go to ~24hz -0dB (speakers aren't positioned symmetrically in the room). I've only owned these little over one year but as you said, there's no temptation to change them. Little by little I've been able to extract more and more out of them with small tweaks, measurements, acoustic treatment and positioning.
As price of electricity climbs up to new record heights, I wish ATC would've implemented a standby function to their active speakers. But that's another discussion.