Just spotted it's $10 now, so not a painless thing to try if you're on the fence. FWIW it's worked well for me, decent quality and the latency is not an issue at all for screen sharing, not immediate obviously, but for whiteboarding etc. definitely not an impediment (YMMV dependent on your local network).

Also while it isn't a 'universal' app with an iPad specific interface, the interface is just the button to start broadcasting the screen so other than looking a little awkward on launch, again it's not an issue in terms of the output, you'll still get the full screen.