In for 20 units at the moment. Possibly more depending on price. Max 60.
That would be why you want 20+ units then would it?
He must be doing it for the fun of it. Times 20 (but not greater than 60) haha.
EDIT: I did plan on buying 20 units. I still plan on it if the price is right. ~0.7 BTC. However, I suspect this won't be so, and I advise anyone to not buy miners unless they are less than 0.9 BTC.