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First off, what is this? Essentially its a bracket which lets you install a 2.5" SSD into a 3.5" bay inside your computer case.
An SSD (Solid State Drive) is the newest form of storage for your computer. Essentially does the same job as a hard drive, but typically has less storage space (however, as technology improves sizes increase). The problem with an SSD is that it's smaller than the typical fittings inside most computer cases. It is, however, perfect for laptops. So, bearing this in mind, if you want to install an SSD in a desktop you will need to use a bracket.
As to the product itself, installation is simple enough. The SSD is screwed straight into the bracket, which is then screwed into the case in the same way as a typical 3.5" drive would be. The bracket leaves plenty of space around the SSD which helps with cooling, there is nearly an inch on one side which is empty, and the bottom of the drive is also free for airflow.
Whilst some SSD's will come with brackets, many do not, and that makes this an essential component for installation.
If you want an SSD in a desktop you will need one of these, if the drive doesn't come with one then this is a good option. However, there is nothing to distinguish this product from any other that does the same job. To be honest the best option is to go for the cheapest bracket there is, regardless of brand. It doesn't do a complicated job.