Bear in mind that though this external Alienware Graphics Amplifier is a plug-and-play solution but it doesn't work exactly like Nvidia Optimus/AMD Dynamic Switchable Graphics such that you can toggle between internal discrete and external graphics both ways while laptop is operating.
If you got to leave the place with your Alienware notebook, you need to shut down the entire laptop first and then to plug out the amplifier cable (or vice versa also possible) and then turn it on to switch it back to internal discrete graphics. Laptop will automatic goes into shutdown once you plug out the amplifier cable while the laptop is still turned on. In this mode, sleep function will also be disabled, leaving only shutdown option available.
This can potentially cause data loss issue to many as people may accidentally forgot to save their work on the notebook right before plugging out the amplifier cable, thinking that it is a 2-way plug-and-play dock as it seem to be one since you can plug in to operate while laptop is already on.