I've been using two pair of XpanD X102s for several weeks. Today I received two pair of Optoma ZD101s, one each from two separate vendors. I put on some 3D content, the Panasonic demo disk, to see how they compared. The Blu-Ray player is a Panasonic DMP-BDT350 and my display is a Samsung HL67A750 LED DLP. Both glasses sync the same and require the display to be set in the 3D reverse (Mode2) mode.
Performance wise, they are very close, too close to call. Both produce a fine, crosstalk free picture and I enjoy watching 3D content equally.
Without putting a meter on them, I subjectively suspect that the Optomas "might" be ever so slightly brighter than the XpanDs. The reason I think this is because the rainbow effect is a tad more noticeable with the Optomas. However, the viewing was accomplished in a brightly lit room and the human iris plays tricks when switching from one set of glasses to the other.
The rainbow effect disappears if the glasses are tilted 45 degrees sideways. It's the same with both brands. When I do this I notice that objects in the background tend to lose focus. The rainbow effect may or may not be more noticeable on the Samsung DLP display relative to a Mitsubishi. Since I'll never have the opportunity to view them both side by side I'll make no further comment except to say that the rainbow effect doesn't bother me at all. I know it's there, I see it, but then I forget about it and watch the content. Your experience may differ.
The XpanDs use proprietary batteries. The manufacturers web site states that replacements are available from them and authorized retailers. I checked several retailers sites and couldn't find any batteries for sale so at least for now it looks as if replacements can only be acquired from XpanD. They are expensive when shipping costs are included but have a long life - 120 hours advertised. Replacement is a PITA until you learn the proper technique. One thing makes changing them considerably easier. There is a rubber O ring used as a water seal and the friction it creates makes removing and installing a bit difficult. I'm not planning on running my glasses through the washing machine so removal of the O ring greatly reduced the effort required to screw and unscrew them.
The Optomas use two common CR2032 batteries and the usable viewing time is said to be 70 hours. Over time, total battery cost should be about the same between the XpanDs and the Optomas. However, the Optoma batteries can be found at your nearest hardware/pharmacy/gas station etc.
Comfort: You'd think the XpanDs at 2.5 ounces would be a little more comfortable than the Optomas at 2.9 but it doesn't make any difference. In fact, with the three interchangeable nose pieces that come with the Optomas I find them a little more to my liking.
The XpanDs turn themselves off automatically after a period of time when no DLP-Link signal is sensed. The Optomas will fool you. You can press the power button and lose the 3D effect but the glasses are still powered. You need to press and hold the power button for three or four seconds before the power is turned off - indicated by the room (as seen through the lenses) brightening up and staying that way. The manual states, "To turn off 3D Glasses Press the power button and hold until the LED switches off" I'll go with that but the positive way to see that the power is off is to look through the glasses and see it as it happens.
Shipping box/packing: The XpanDs come loose in a box with bubble wrap protecting the lenses. A battery is installed. There is also a spare battery, battery changing tool, and an instruction manual included. The Optomas come protected by form fitting foam including the three nose pieces in their own little slots as can be seen in the accompanying picture. The batteries are factory installed and there are no extras. There is also an instruction manual included but the on/off button information is less than clear. If you don't turn them off properly the 70 hour battery life will be used up in three days time.
I'll watch a little more 3D tonight in the dark and see if it makes any difference re: the above observations and opinions.