on February 21, 2015
I am running this eSATA card on Lenovo W540 workstation laptop, running Windows 7 64 Ultimate. I have tried 3 other eSATA cards - they don't work (either gives me blue screens or hang up the notebook). This one works perfectly. As stated, it is AHCI compatible - so no need to install a 3rd party device driver. Windows 7 default driver is enough. I connect this eSATA card to an Addonics S4SHU3 box - using 4 Samsung 850 EVO 1TB SSD - configured as RAID 0. The performance of the I/O is more than enough to support 4 streams of HD video (using my Panasonic HPX250).
on April 8, 2014
I've tested this on a 2010 MacBook pro using both Snow Leopard and Mavericks. I have a 3 TB LaCie D2 Quadra hard drive (no Thunderbolt) attached through this eSata controller for backup and external storage. (Note: early versions of Mavericks had a problem with the computer not recognizing the 2010's - and only the 2010's - ExpressCard slot. This was an Apple problem and has been fixed as of 10.9.2.)
It works very well, one very minor complaint is that unlike the built-in USB/Firewire/etc ... ports, this won't gracefully unmount drives if you put the computer to sleep without unmounting the drives yourself. This is not a problem with the controller per-se.
A more major problem with the controller itself is that the computer won't boot up with the controller installed. It doesn't get passed the initial gray screen, nor does it give the start up noise. I am not trying to boot from the external drive attached to the controller (which Sonnet says explicitly cannot be done) - I'm just trying to boot up the computer with controller already attached - I tested this on both Snow Leopard and Mavericks and it was the same for both. Sonnet customer support was unable to explain why this was happening. Hot plugging the controller works fine. Thankfully I never turn the computer off or send it to sleep, so for my purposes this matters very little, but I may still ask for a replacement as I am under warranty and the controller does not completely work as advertised.