You rarely see a serious home theatre on the forum so you might not get a hit.
I’m also looking to build a full cinema setup and have been looking at these. I’ve been looking at a fairly broad price range and the ATCs are about in the middle. For additional food for thought, you might also consider PMC Wafer2 which cost more. Or KEF T-series which cost much less. Dali do a similar on wall speaker with a rotateable tweeter.
One other spanner in the works is whether to divide a budget into 5.1, 7.1, 9.1 or an ATMOS setup. My dealer and I don’t quite see eye to eye here. They are of the opinion that better 5.1 will always be better than 7.1 or 9.1. So if you’re blowing $20k on AV speakers, always blow it on better 5.1. Makes sense up to a point but you can up your budget to $40k to get the same speakers in 9.1 or spend $40k on even better 5.1. We all know that even realky good stereo is better than mediocre surround. So by their logic, you’re better off spending your entire AV budget on stereo. I’ve set my mind to no less than 7.1.
NHK and Dolby Labs did research that found once you get beyond a certain minmum fidelity threshold, the number of channels becomes far more important to supporting visual cues on screen. NHK have a flagship 22.4 proprietary format.
Circling back on topic, the ATC are probably great if you have suitable amps and source material is Blu-Ray rather than streaming. But the same budget might do 7.1 with KEF or 9.1 with something like Qacoustics (wall brackets for standmount speakers).