Compared to P2 cards they are. Our TV station bought 32GB P2 cards and I was told they were $1000 each. I found the 64GB compact flash at $699.

Hi Hedley,

I use Photofast 64gb cards in my Z7's. You can buy them from Birdwatchers Online Store. I haven't had any problems with the cards.

I discovered that if you formatted the 32GB cards they went bad, i got an error code on the MRC1K, and I had to return them. These are Transcend 133x which otherwise work perfectly well. Now I never format them, just delete all clips, and so far not a problem.
The 16GB version of the same card works perfectly well, I can format them and they work afterwards!

Interesting - I've had three Transcend 133x cards go bad on me - one when I dropped it, one when I tried to format it, and one when I removed it while the camera was switched on. I'll take your advice and delete only - thanks. Can't afford the premium for 64Mb cards yet.

That's interesting - I've always formatted my cards, only because I was told to do that with digital SLR cameras and have done so since the earliest DSLR I owned, a Nikon D1.

I've been given a replacement Kingston 133x 32GB card and used it a couple of times so far without a problem - on Saturday I filled the entire card filming an ice hockey match.