the tensioning system in the model B deluxe consists of a folding metal tensioning arm that runs down the middle of the back of the screen. essentially, this arm applies downward pressure to the middle of the lower slat bar. the effect is similar to hanging a weight from the screen pull. it is not like the tab-tensioned screens which apply tension to the fabric from the sides. i haven't seen one recently, so i probably shouldn't comment on how well it works. but, if this simple system were able to produce a flat screen surface, one would be at pains to explain why so much has been invested in the more elaborate and expensive tab-tensioning systems.
I'm on my second of these crinkly beasts. Unfortunately, the first developed a V down the middle, exactly where the tensioning bar pulled it. The second has a number of vertical wrinkles. It really depends on how much you want/have to spend. I live with it because it's still MILES better than the TV and I haven't had the chance to look at alternatives.
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