I tried both the xpand x104 and x105 (lites) and they seem identical when it comes to crosstalk and overall performance. The x105s are much lighter and the thinner frames are less obstructive to your vision. They also did a better job of syncing with my projector on the first attempt. The only downside to the 105s is that they pinch slightly at the back of the head, but overall they are fairly comfortable. I would defintely recommend the x105s over the 104s if price is of no concern.