Just a heads up.
I purchased 4 128GB CF Lexar (1000x) Pro Cards around 12 months ago, 1 arrived Dead as a doornail, it was replaced, eventually ended up with 4 that worked. The reason I purchased these cards was they had a speed advantage over the 128GB Sandisk Extreme Pro Cards at the time, not a lot, but I felt they would be an advantage in my 1Dx, 2 Cards, same faster speed.
In the last 12 months I've had seriously corrupted files on all but 1 of these Cards, never ever ever had that issue with my 128GB SanDisk Extreme Pro Cards, never. And the Cards were used in 2 different 1Dx bodies, so the issue has been the Lexar Cards not the 1Dx.
I had to use SanDisk Rescue pro on 3 occasions to access my files as the Cards could not be read out of the Camera.
I now use these cards only as a back up to my SanDisc Cards and only after completing a deep reformat on all 4 Cards, not been impressed at all with Lexar, and at a premium on price to Sandisk, I'll not purchase another Lexar Card after my poor experience with these.
Perhaps the lower capacity cards aren't as prone to issues, don't know, don't intend to find out.