Works perfectly in my Apple PowerMac G4 Graphite that has a busted built-in USB controller. Both MacOS 9 and X Tiger recognizes the new interface. Great stuff!
Works fine with Winh2K SP4. Installs automatically. Works OK with USB3.1 flash drives
On Win98SE had some issues. Installs USB1.1 driver only automatically, have to download USB2 driver and install separately. Find at 'storage.microsemi.com' Doesn't work with some USB3.1 flash drives.
Didn't try installing on WinXP
I was having issues with my VIA PCI USB2 card with USB3.1 flash drives. The Adaptec card is only slightly better. And it's hard to find USB3.0 flash drives now