You no longer have to purchase expensive projector lamps and experience unexpected burnouts. Shadowing on a projected image is eliminated. Projector light shining in users eyes, eliminated. Maintenance to change filters on a projector, eliminated. Much cleaner and crisp image than a projector are capable of producing. The display will not be washed out by the sun or ambient light. Less wiring than a traditional interactive system. Many units are available with an optional built-in PC. This makes a true "All in One" system.