Well if its just the screen, than like Zoonie said, some parts are going to be out of focus, unless your planning on using and syncing multiple projectors, maybe get some large scale eye-finity games going? XD
[citation][nom]Azimuth01[/nom]$1,269 for an 84" HD screen in someones basement rec room is not unreasonable. Was this price a typo?[/citation]You didn't read the article. It's a projector screen.
Oh and hey, I can make a curved piece of projector paper too! (takes the frame off a school projector rollout and bends it) $Texas
As long as the curved screen matches the radius achieved at the distance from lens to screen in an equidistant arc , it will be in focus. The shorter the distance the greater the bend but at 15 feet there wont be a sharp curve.