The reason OWC's dock 'spontaneously' unmounts drives is that it is poorly shielded. Try putting an iPhone next to the dock then call it. Boom, drives are gone.
Also, this dock won't power the MacBook? That's a drag.
I am on my fifth pair of X2s. They are not really sweat proof and eventually will die. To their credit, Jaybird keeps replacing them, so kudos for that, but they even tried sending me a set of the Freedoms and they have failed too.