I have Thermaltake SATA HDD (USB 2.0 and eSATA)dock and it works perfectly with Mavericks on the iMac in my signature line.
I originally bought it from Best buy to work with my 2009 iMac and have used it with: PowerMac G5 quad, 17" and 20" iMac G5s, iBook G4s, PowerMac G4, my wife's 21.5" late 2009 iMac, and now my current 2013 iMac.
It's been great with simple iTunes/iPhoto storage, as external boot media, and especially for backing up and then reinstalling Oses on PPC Macs.
It's been great and would definitely recommend it.