Bought this card a week ago when I got my new Nikon D850. Took less than 50 test shots, deleted photos and reformatted the card once or twice. The card now reports an error. Unable to reformat to fix the error. The card is a total loss. Now I have to find it in the store for tomorrow's photo shoot. I hope to find another brand other than Sony. [UPDATE May 12, 2019] I went to my local camera shop and spoke to one of the salespeople. He recommended Delkin Devices' XQD cards, not Sony's non-Sony XQD cards. They're a bit more expensive, but I haven't had any issues with the card before, during, or after the client's photo session.
Memory card Samsung microSDXC 256 GB Class 10, V30, A2, UHS-I U3, R 130 MB/s, adapter to SD
50 Review
Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
45 Review
π½ 512GB Samsung Evo Plus Micro SDXC Memory Card
40 Review
Silicon Power Elite 64GB microSDXC 2-Pack Memory Card with Adapter for Nintendo Switch and Wyze Cam
57 Review