I wanted this dual card reader to keep permanently with my travel gear. Have one on my desk that has worked great for years. Good speed and I love that it is magnetic and doesn't slide around.
This reader allows me to transfer files 3x faster than my standard uhs1 reader. I have transferred 4 cards of video files with it so far. And it's giving me 250 to 300 meg/sec transfer speeds (vs 80 to 95 with the standard uhs1 reader).
I have not tried the CF card reader part of it.