Pros: Cheap. Decent construction for being cheap. Can be locked. Keeps 7200 RPM adequately cool. No data transfer bottle-necking. Not unbearably loud.
Cons: Small fan is a bit high-pitched; will be the loudest part of a silent build if using a quiet HDD. All-plastic construction.
I purchased this rack in July of 2012, putting the time I've been using it at about 1.5 years in my current rig. In that time, this single 5.25" bay rack has continued to function without a hiccup, housing a 3.5" Samsung Spinpoint F3. My main reason for buying it was to provide a fast avenue for disabling the drive (not hot-swapping) when I wanted a silent working environment and didn't need to access my media drive, which is the loudest part of my build and tend to resonate. The fan included with the rack is a fairly small diameter, thus tends to blow at a high RPM and produce a small whine, albeit not much louder than the HDD but still noticeable. Other than that, it serves its purpose and hasn't given me any problems. See additional pictures of the rack for some extras that I uploaded.