So I bought my initial set of AirPods Pro back in February. In March the fit-test started failing on the left one (also lack of bass), and it was replaced at the Apple store. Once quarantine and remote work started my usage of these fell off quite a bit, but still used them for walking and outdoors.
In July a rattle started with the right one. I cleaned with blue-tak a few time which seemed to help, but it finally got so bad that this no longer made a difference. The only time it didn't rattle was when I was not moving. Also the fit-test started failing on the left one again.
Apple just sent me two replacements. Strangely they came in separate packages, and were each packaged differently. After some fooling around as they were on different firmware versions I finally got them to pair and am sending the others back. Just a hold from Apple on my card BTW.
I am seriously considering moving these on and finding a replacement, but am unsure. I owned the Sony XM3's at first and I found the treble response irritating, and the mic quality wasn't good enough. I've been watching the new releases but just haven't yet seen anything that comes close enough to these with the ANC/sound quality/mic quality.
The alternative of course is getting them replaced every three months or so, which is absurd.