It makes a HUGE difference!!!!
I already taped off the rest of the walls, I'm going to paint the rest either tonight or tomorrow. It took three coats to fully cover it.
I also got one of the samples of the peel and stick wallpaper in - I don't know if its a roll it works better, but I tried and tried and tried to get the backing off and literally the only thing that worked was actually tearing the sample. It didn't look great either once it was done (although the sample was smaller than I thought it would be so I don't know if it might have looked better as a whole wall). I'll hold up the other two samples when they come in but I'll probably just keep them for craft projects instead.