They DO seem to work fine with the Optoma HD131Xe!,
Verified Purchase(What is this?)
This review is from: SainSonic Zodiac 904 Series 144Hz Rechargeable 3D Shutter Glasses for Acer/NEC/BenQ/eMachines/LG/Optoma/Vivitek 3D-Ready DLP Projectors*Black* (Personal Computers)
Not sure why the product listing says "not compatible with HD131Xe" - I brought these specifically to use on my Optoma HD131Xe and they work just fine. I worked out, if what you are seeing doesn't look quite right, just click the 'on' button once (when they are already switched on) and it seems to switch between two slightly different viewing modes, one of which will be the one you need.
I have compared them to the actual Optoma glasses and I can't see any difference in the performance.