A live demo is up to give users a taste of the experience that Shumway offers — if their browser is modern enough to handle it.
In tests we ran, performance was fine on desktop versions of Firefox and Chrome — but on a Samsung Galaxy S II, the latest Firefox beta could only get 4 frames per second in live demo, and Chrome could only handle 1 frame per second. Clearly, a bit more work needs to happen before Shumway is usable on the type of mobile devices where this project would be useful.
Users can download a beta build of Firefox and install a Shumway extension to test Shumway as the primary SWF renderer.
As with any project in its early stages, users are warned that Shumway is "very experimental, is missing features, contains many defects, and is evolving rapidly."