As far as I can tell, there are 2 main dry erase paints on the market - IdeaPaint and Rust-Oleum Dry Erase Paint. They have the same purpose but differ greatly in price (IdeaPaint being almost 10 times more expensive).
Of course IdeaPaint say that their product is vastly superior but has anyone actually tried them both and compared them? I've seen mixed reviews even for IdeaPaint and would not like to waste money if the paint doesn't work well on my wall.