I tried the Pixel 9 Pro Fold, I've been using it for over a week now and this phone is fine. Nothing special, but definitely not bad.
It's main weakness is the operating system. It just feels like a large phone, instead of a folding phone. The lack of home screen customization, the lack of the always-on-display customization, minor HDR issues, and the lack of true 'folding phone' software.