[mattw]

Did you put it on textured walls? From their video, it looked like the material was very thin, so I wonder how well it works on any but the smoothest walls.

[mahipal]

I have my "Bertha" on a textured wall. It works fine, although you can still feel a bit of the texture through it. (The texture is "damped," if you will.)

I don't think it would be a problem for anyone except the most OCD of users.

[whimsy]

The material is paper thin.