Freeze Drying Your Own Milk

Just wondering if anyone had bothered to freeze dry their own milk for use in chocolate making?

Also I have heard of spray drying and roller drying for making milk powder, are there any companies that make milk powder by freeze drying, perhpas this is too energy intensive and the other methods are cheaper?

That said I have a freeze dryer at work now so will give it a shot with some excellent local dairy milk.