Conclusion: The Epson BrightLink 485Wi business projector is more expensive than the competition, but the price includes two pens, a mount, and the ability to use the interactive whiteboard with any image source.
Pros: Ultra short throw. Interactivity works at full brightness. Can use interactive feature with any input, not just computers.
Cons: Have to touch screen to interact, which means screen has to have a hard backing. No 3D support.