I have 3 of these ThermalTake BlacX units.
Newegg.com - Thermaltake BlacX ST0005U External Hard Drive SATA Enclosure Docking Station 2.5” & 3.5” USB 2.0 & eSATA
1 is connected to the eSATA port on my DVR and spins 24x7. 1 is at work, and 1 is at home. All 3 have been flawless.