The GT72S passed the Oculus compatibility test and scored a 7.2 on the Steam VR Performance Test, putting it in the middle of the "green" zone. It's not going to have any issues with running current and likely most upcoming VR games and experiences, and that's not surprising with a desktop GTX 980 running games.
The lack of restraint in the system's hardware design makes it ideal for virtual reality in a number of ways. There are six USB ports on the laptop in total, with two on one side and four on the other. The HDMI port is located on the back of the system, but the Oculus Rift has enough spacing in the cable that you'll be able to connect both the HDMI and USB cables needed for the headset without much trouble. This also leaves plenty of room for the large USB dongle required for the Xbox One controller, even without using the included extender that comes with the Rift.
The HTC Vive was just as easy to connect, leaving plenty of USB cables to charge the controllers if need be.
The value of a VR-ready laptop like the GT72S isn't just the lighter weight and enhanced portability you get from even a laptop this large over a desktop system, but the fact that the monitor is powered and included in a single package. It's a single piece of equipment, with a single power cable. I did notice that the touchpad on the system is pretty terrible in general, but without a ridged line it's impossible to feel when you're using a headset. I fixed this by adding an external mouse.
You may not want something this big to watch a movie on a plane or write a term paper inside a Starbucks. But the ability to quickly and simply set up a virtual reality rig wherever you'd like is powerful, and part of the reason one may want to pay the premium for a gaming laptop over the lower cost of putting these same components into a standard case, plus a monitor.