I had 2 Lexar 1000X Professional CF cards literally die on me. One time after taking 500 irreplaceable
vacation photos and the second time after 2 hours of a paid shoot which I had to restart completely.
I went back to Sandisk Extreme Pro 1066X which hasn't failed me in 13 years.
Save yourself a headache and don't buy Lexar.
It's not an Anecdote. It's a fact. 2 cards from different batches failed. Also your beloved transcend also failed me.
You buy cheap, you get cheap.
And exactly how do you test a CF card thoroughly? There is no way.
The testing should be done at the factory. It's called quality control. I use the card normally and I perform 3 formats before working and you never know when the card is going to fail. There is no warning.
None of the software I have was able to see the cards so there was no way to recover any data.
At one time I was using 2 simultaneous cards just in case but it slows the çamera down so finally sandisk came out with a 1066x and now I have no problem.