Delkin Devices 512GB Type B Memory Card

I needed one more CFexpress card for my Canon EOS 1D X Mark III as I like to have 4 available to use (2-in camera and 2 back-up/spare). While I have seen the Delkin name around, I've not used them before. After looking into the company and their products, I took the jump and ordered one. VERY glad I did! Well...... at first I was a little put-off. The description for this card shows the READ SPEED as 1730MB/s and the WRITE SPEED as 1540MB/s which is blazing fast. However, the card I received (see photo) shows the READ as 1600MB/s and the WRITE as 600MB/s. While the 1600MB/s isn't a deal killer on its own, the 600MB/s is. My Canon 1D X Mark III requires a card capable of VERY fast write speeds and the 600 would have killed the deal. Somewhat disappointed, I called DELKIN, and nearly immediately was speaking to a live human here in the US. I don't recall his name, but he was in Technical Service and was extremely helpful. He explained that the cards were in fact 1730/1540 however the labels were ordered with the error in speeds but still made their way to customers. Satisfied, I took the card and placed it in my camera and did a few test shots - all seemed fine. Then for my next photo assignment, I dual wrote to my 2 cards as a safeguard in case there was an issue with the Delkin (I would recommend this to anyone using either a new brand of card or on a new platform). The card performed flawlessly. On my next assignment, confident in the card and its capabilities, went to a single card write and the card again was bulletproof. As far as the speed? Well, I did a few 35-50 shot bursts with ZERO buffering (at 16fps - frames per second). That would have choked a 600MB/s card... Then I went full monty and shot a ~100 pic burst in Live View Mode which is 20fps and again had ZERO buffer. By the way - I ONLY shoot RAW and each RAW file is around 20MB so a 20frames/second on 600 MB card would choke up after 3-5 seconds and kill the buffer. I was never throttled nor did my buffer ever drop below 99... 99 is the default number for the buffer on this camera - but the "real number" is closer to 1,000 frames. All that to say - this is an exceptional piece of kit. Well made. Reliable. Affordable.