Hi Ron
Slightly off point.. but like you I had a USB2 computer with the express card slot.. because the older reader was a pain with AC power and slow USB2.. but the USB2 of the computer out to HDD was very slow too.
I changed to an Airmac and the “newer” USB3 card reader.. which BUS powered and very fast.. no driver needed (mounts as a drive) and you have TB or USB3 outs.. if your thinking to “upgrade” Ive found this a good combination.. and only the UDF driver to update..