The intention isn't to be faster than the internal bay, it's to add another drive to machines with limited drive support. For instance, X230 only has a single S

The intention isn't to be faster than the internal bay, it's to add another drive to machines with limited drive support. For instance, X230 only has a single SATA3 drive accessible. You can add an mSATA, but they don't come in very large capacities and the mSATA slot is limited to SATA2. This mod adds a third drive, one that goes up to 2TB at ~SATA3 speeds. So, depending on the model, it can either be a nice addition or a huge addition.