The black velvet does a good job of catching overshoot (intentional or otherwise)

but they did an awesome job!

The black frame does a great job of absorbing any over-shoot from the projector.

Their job would become easier if the company did a better job with this whole stretching business or made some improvements to the product that reduced this need.

For the novice or casual movie-goer it gets the job done (like kids and non-techie spouses), but if you're like me and want a superb picture to see all the detail in low light scenarios, save your dough and get one of the premium brand screens.