Price / Performance Top - but nothing for perfectionists!

I was buying the canvas of course clear that I can not expect a perfect product.
Therefore one must look at the difference in price to an expensive screen only once.
My expectations were exceeded but - and I also have to say that this is my first canvas, and I therefore have no means of comparison.
You can also set the end position in which the screen extends, which was very important for me.
For me, this canvas is perfectly adequate and I am always excited when I look, for example, football in size.
But there are also deficiencies:
1. Light wave formation. Not bad, but in football or other smooth surfaces it falls on.
2. The canvas makes startup / shutdown grinding noises. So not the engine (which is fairly quiet), but anything looped as long as the screen is in the upper third.
3. The canvas rod hangs at me wrong. If the screen is extended, it does not stand out. Stowed the rod rests with me but right on screen housing to the left are 2cm air.

I would buy the canvas again, as these shortcomings do not justify for me to pay many times for others.