It's an image projector rather than a slide projector - it slots into a profile lantern and doesn't have its own light source. I used a couple of them two years ago, and the way I see it they have one major drawback in that you have to use the Rosco slide kits to fit the image into them, and each slide kit can't be re-used, and from memory, they're not cheap. You also have to run power to the iPro separately from the lantern and there's some fan noise (probably not an issue in a medium-sized venue, but still needs to be taken into consideration). Yes, they work, but IMHO there are better ways - a Selecon Pacific will take an acetate gobo without an iPro, which to my mind is a much better idea and a much better investment!