Neither the hooks are broken (I run the screen in ceiling suspension), nor are there any dirt, even problems with the roll-up mechanism. The manufacturer has these problems may now under control. Perhaps I also had just lucky. I suspect most likely that these problems are relatively rare, but you naturally his mind rather then manifests when there is a specific reason.
In the beginning I noticed also some V-shaped waves. In addition, the canvas rolled slightly to the left and right edge forward. After three to use seems to have but placed in the truest sense of the word. Today I can think of no more bumps.
The surface of the canvas is immaculate, with no scratches, stains, wrinkles, etc.
Of course there's also negative: The metal roll box is twisted a little in itself. Furthermore, the screen does not roll on the exact center and also produced here more noise than necessary. Furthermore, it is necessary, the canvas air out 1-2 days well. Because it shows the lower quality, but the function will not further affected.
For this price you can buy in my opinion quite risk. The next level of quality starts only at twice the price. If it really should give serious problems, you can still take the warranty service, as with other products too. Anyway, I'm very satisfied so far (about 1 week).