I do and I am using the product for this purpose. its a passive box so it does not colour your tone in any way.
I agree that using the L6Link the sound is pure (no hum), but when I record I typically go through the front input (because I like the sound it produces), and with the USB cable plugged in to the HD500x, I was getting a tremendous hum in the DT25 which is not good for recording. I found using this box in the signal path as I described above eliminated the hum coming out of the amp with no side effect to sound quality.