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Before I even had my A1 in hand , this past summer in anticipation of finally getting one reasonably soon I went ahead and bought one Sony Tough CF Express Card Type A and then later after I was actually using the camera bought a couple more.  I  tend to keep a 160 GB one in Card Slot 1 and an 80GB one in Card Slot 2 since I often shoot the geese and ducks on our lake.

At the same time back in the summer I also bought the MRW-G2 card reader and that has worked out well for both my CFE cards and the Sony Tough SD cards that I still use in the A7R IV and the two RX cameras.  I keep it plugged in all the time for ease of use since I shoot fairly frequently, and there have been times when I've noticed that it's a bit warm even when I haven't been using it at all.    It does get pretty warm when I am using it, especially with the 160 GB card  if I've come close to filling the card to capacity, which isn't hard to do when one is shooting in Continuous High + at 20 fps!  It doesn't become so hot that it becomes difficult to handle, though.    I usually remove the card(s) fairly promptly from it after having gotten the files into the computer, and most of the time I shortly thereafter put the card{s} back into the camera and format so that the card(s) will be ready for the next round of shooting.

So far I have not experienced any issues with either the cards themselves or the card reader -- knock on wood!