You've probably seen all the Youtube reviews, and the goggles pretty much live up to expectations. It's worth upgrading the firmware (which unfortunately doesn't seem to work with Linux, I had to use Windows to get the storage to mount), as that seems to improve image quality. If you are moving from goggles with a wide angle of view, be prepared for a moment of disappointment when you first put these on; at first I was wondering how I was going to be able to fly through that tiny little square in the distance. But you do adjust quite quickly, and once you get used to it, there is more information visible than with beginner goggles. After a while you don't even notice that the display doesn't fill your field of vision.
If you use the diopter lenses, they are very tight to change. The secret is to loosen the three screws holding the casing together before swapping the lenses over.
Overall, I'm very pleased with these so far.