I've used a few different screens and one of them was a second hand elite screen, probably the best one yet, but that was a electric roll down screen so you get the creases and wrinkles.
Then I made my own out of that screen by putting a few timber sticks together and nailing the screen on to it, not bad, but still not flat.
Then I bought this one, man it is unreal!
For those who just bought it and are having trouble putting it together - make sure you do your measurements well, here's what I did:
Hanging nail to projected image is 3.8cm away, so what you want to do is mark the exact point on the wall (find a stud that supports it of course) then put the nails in.
Now go to your projector and move it into place for the screen to center and square in the frame.
That's it, enjoy!