I'm not familiar with the Torus, but I own a tab tensioned M2500. I am having to live with optical problems with the screen fabric.
These are two fold. The first is vertical streaking. These are streaks that show up on pans across snow scapes, sky views and the like. Sports events especially football and soccer, are badly effected usually bacause of pans across a green football field. The second is a texturing problem that can make the image look slightly dirty. If you seach the forum you should find that a number of us have had such screen issues with the M2500 material. If I did not have these problems, I would be very pleased with the image. The gain is probably between 2 and 2.3 when you sit at the centre of the image. If you decide to go with this product, make sure your dealer knows that you are aware of the streaking issue and will refund or exchange if need be. Good luck,