I have the late 2011 MacBook Pro 17"(purcahsed July 2012) and have two Sonnett Technology Express/34 cards.
One is the plain 2 port eSATA card and the other is Sonnett USB 3.0 card.
After upgrading to Maverick and re-installing the drivers from Sonnett's web site, I found that the Time Machine Backups using the eSATA card to a NewerTechnology Voyager dock with a WD 2TB Cavier Green hard drive, was very much slower than with Mountain Lion. I have a second card by another manufacturer (forget the name) but both use Silicon Image S3132 chip set, and the most recent driver on Sonnett's web site (which works for both eSATA Express/34 cards) is from November 2011!
Also, the USB 3.0 card never really worked even in Mountain Lion although Sonnett has a 2013 driver update.
I have a Buffalo 1TB Thunderbolt/USB3 drive and a LaCie Rugged 1TB Thunderbolt/USB3 drive. Neither show up in Disk Utility or mount on the desk top using USB3. (I also own a spring 2010 MBP 17" which does not have Thunderbolt).
Of course there are much more recent drivers on Sonnet's web site for Windows than for Macs even though they prominently features Macs on their web pages. And all cards work fine in Boot camp Windows 7/XP Pro 32 bit. So it looks like I'll have to go back to Mountain Lion as Silicon Image doesn't care about supporting (updating drivers) for Macs.
By the way, where may I download the driver you mention in above reply to some one else:
"I re-installed the driver (using v1.2.6 release Nov 2012)."
What web site may I download this driver from.
Thanks very much.