Interactive Projectors in the Classroom

I was looking up different videos on youtube today related to teaching and technology and came across a promotional video for a Boxlight ProjectoWrite Interactive projector. Basically, it works exactly like a regular projector, except you can write directly on the screen, like you would using your mouse with Microsoft Paint. I think this would be a great idea for elementary school students, because unlike a simple overhead projector, they don't have to manipulate the object being projected, but they can write directly where the image is projected, just like on a whiteboard. For instance, if you were teaching a lesson on corrective writing, the teacher and the students could take turns correcting mistakes on an example using this tool. If they were learning new math concepts, they could write directly on the worksheet or website page they were viewing without even having one on hand. If they make a mistake in the corrections or when writing answers, they can simply erase and start over. Also this could be a great tool to help students to collaborate with one another through discussion, and it helps with their visual and kinesthetic skill building. I would love to be able to have a tool like this in my classroom for nearly every subject.