This is a review after four months of using the card. Extremely fast access, it comfortably keeps up with the highest RAW framerate that can be achieved on the Nikon Z9.
Good value for money, would highly recommend as the primary or secondary memory card.

I finally got my hands on a proper CFexpress 4.0 Type B reader. It reaches speeds up to 1585.62 MB/s Read and 1500.32 MB/s Write. However, I'm using a USB 3.2 Gen 2x2 port, which might hamper the performance somewhat. At any rate, after about 6 months of use, it's still been pretty reliable. I haven't come across any errors or format issues, so that's good. Definitely recommend.

I bought this guy recently before a trip to Magee Marsh in Ohio. So far, it's performed very well. Being able to get 660GB for $300 is a very good deal. Of course, most probably won't need to do this unless you shoot a lot of stills and do both 4k and 8k high-bit rate video. I have not noticed it getting hot or any of the labeling coming off, or it falling apart due to removing it from my Canon R5, so far.