I can't speak for WHS, but I have the single version Black X, not the Duette. I love it and have had no problems with it. Mine is USB/eSATA. I use the eSATA and it works very well.
+1 for the Thermaltake BlacX. I have the single version of both the USB/eSATA dock and the USB 3 dock. The USB 3 dock is backward compatible with USB 2 and both docks support either 2.5 or 3.5 HDD's.
System Manufacturer/Model Number Customized build from CyberPower OS Windows 7 Home Premium 64bit SP 1 CPU Intel i5 2500k Motherboard Asus P8P67 Deluxe Memory 8 gigabytes Corsair PC3-12800 DDR3 Graphics Card EVGA GeForce GTX 460 superclocked Sound Card Integrated Monitor(s) Displays ViewSonic 23" LCD Screen Resolution 1980 x 1080
Keyboard Logitech USB Mouse Microsoft 3 button PSU Coolermaster 1000 watt modular Case Coolermaster HAF X full tower Cooling Coolermaster Hyper 212 plus Hard Drives 120 Gb Samsung 840 Pro SSD
120 Gb Kingston Hyper X SSD
1 Tb WD Caviar Black HDD Internet Speed download 1.5 Mb/sec upload 300Kb/sec