Review on 📷 Lexar Professional 1066x 64GB (2-Pack) CompactFlash Card, Up to 160MB/s Read, Ideal for Professional Photographers, Videographers, and Enthusiasts (LCF64GCRBNA10662) by Brian Olson

I use these in my Canon full frame cameras - 5DIII and 5Dsr. Haven't lost one yet or lost the picture. They worked well from -15F to 115F. (However, the battery/camera case often begins to fail below zero.) Transfer speed, both to the chip and from the chip to the computer, is excellent, at or above the rating. I have over 10 of these (or earlier versions) and have never had a problem. Period.