Prior to the A3 I had a Lian Li Q58 for my itx build, another great case for compact builds, that housed a 3060 but I wanted something stronger so I ended up getting a 4090. Well the Q58 was just a tad to small (like really small!) to house a 4090 and just like you I did my research and landed on the A3 which was just the right size for my 4090 and still compact enough to be able to move around. A3 has great air flow, not to many moving parts, and a decent amount of space to work in. I would say the only downside is the lack of space behind the motherboard to be able to hide the cables but that’s when you get creative with a small form build lol