We tried this at our work, where we use whiteboards extensively. I am not a fan. You spend a lot of time trying to make them clean over a 2 year period. It's annoying to be constantly replacing them.

We have moved on to http://www.ideapaint.com/products/ideapaint and are really happy with the result. Cheaper then traditional white boards and better then the Showerboards. The room we tested it in currently has had it up for a year and still works well and easily erasing things that have been up for a month.