It could have very valuable effects when worked together with a mouse. If you're on photoshop or modeling in 3D, being able to control 3D space with your left hand while working the project with your right hand (or vice versa for lefties) could be awesome. Think editing a model's vertexes and spinning it around without having to stop your editing... and without the need for any sort of expensive 3D mouse thing. Great tool for productivity. Some games could use it to great effect if they were created with this in mind, but most traditional games would probably benefit much from it, tho.