I got a poster linenbacked and the linenbacker removed all the rips and tears, and some writing on the back that bled through to the front. It came out nice and smooth with no stress wrinkles.
Chop-Top, I posted a pic of my HATED poster that I'm getting linenbacked. Right now I just have the "before" pics up, as you can see it is severely wrinkled and damaged. I should be getting it back later this week and I will post the "after" pics. It might be a good reference for you.