These are by far some of the best glasses on the market. Compared to the previous xpand versions, the X103/102's these are much lighter in weight and the fit is entirely different. They are very tough, but also very thin. They almost feel like those dollar 3d Glasses that you would get at the cinema, but they obviously pack a lot more. Syncing the piece was a bit of a pain in the beginning, but it really is just a one-time thing. The very important thing to note is that these are truly the size of typical glasses. If you are planning on wearing your glasses underneath them, then go with the larger size. If not, these will fit perfectly on a normal-faced (is that even a thing?) adult male or female. I highly recommend them as an upgrade to their previous models!(p.s I use a sony system and had no problems getting them to work, you may want to look into compatibility...)