I had a 92" DIY screen made from black-out material, hung my rebate screen in front of half of it & watched Terminator 3. I could not really tell any difference between the two. I was glad because I didn't want to spend the money on a real 92" screen.

I just rebuilt my theater with a 105" painted Goo screen, but haven't compared the two yet. Going from memory though, I think it reflects more light? Once I paint my ceiling darker, I can tell better. If you like your rebate screen, keep it. I did the DIY to get a bigger screen.
Dave