It works pretty well but if you use it with FloatingX's weapon's display plugin the weapon's display gets noise interference/garbled when you activate the night vision goggles.
Update: After doing some more testing, I discovered it was with the OpenGL settings. I used OpenGL Classic and having Color Effects checked was causing the problem. If I unchecked it the than FloatingX Weapon display works with the Night Vision goggles but the color is not the traditional green color but it makes all the dark areas bright - like turning on a lightbulb.In Software mode it works without making any adjustments to the Graphics settings. This is Ubuntu 11.04 and testing with Marathon Infinity using the 0.23.3 engine.
Update: Just moved up to alephone 1.0b4 and tested - same results.