I bought 7 of this brand/style blind some were black out and some were semi sheer, but within 2 years 3 out of the seven have failed catastrophically. The plastic bits that hold it in tension disintegrated, causing the binds to collapse. They failed so violently that the spring from one actually embedded itself in the drywall of the window frame. The first two were in the attic where it gets  about 5 degrees warmer and cooler than the rest of the house, so I thought maybe it was the temperature swings  but just last week one failed in the master bedroom which always stayed between 65-75 degrees. At this point I'm assuming they will all fail eventually and need to be replaced. These haven't been through heavy use and mostly just sit there, so for something this expensive I would expect it to last more than a couple years. Now I'm left with the conundrum of buying more to replace the failed ones knowing they will fail again, or buying a different style to replace the rest.