Elite Screens Inc. Airflex5D Multi-Projector 2D/3D Stacking System with Circular Passive 3D/Stacking/Scaling Warping and Built-in QStack Grid System AF5D-30SC

UPDATE: The HDMI input does not work. I switched my review from 4 stars to 5 because the support team really took care of me. The warranty expired on Oct 29th and on Nov 30th I contacted them about it. Yes the dreaded "My warranty just Expired". They are sending me a new box and I only have to pay for the shipping.The Q-stack system works great. It aligns the 2 projectors in minutes, much faster than manually. You must get them very close or the viewing area will diminish. I have not tested the geometric correction, but plan to and will update this.The instructions are horrible! It took me about 2 hours to figure out how to get both grids to show up and align the 2 projectors. When you get that part figured out it works great.The filters that come with it are so so. About the same as I got from a Chinese company, for half the price. The glasses are really nice,but not for the money. I got some glasses (40 pair for $25) and filters ($65) from china for under $100 that do just as good. Just get the option with the box only is my suggestion.The filter or box will not matter if your screen is bad, so make sure you have a good screen. Do not by from china. It will ghost like crazy.I took away a star for the instructions.I have heard Elite Screens support is really bad, so that is something to keep in mind. There is a Geobox that does the same thing, but it cost about 4x what this does. They look and sound exactly the same.