I used a piece of MDF core oak plywood that a friend had given me for a fretwork 'Forest Wren Box' pattern I had purchased from a catalog, I stained it with a dark walnut stain and it turned out beautifully. As a result, I went out a bought a full sheet of the stuff. Any time I'm doing a piece that I intend to stain with a dark color, it has become my first choice for material. Sometimes using a lighter stain gives an attractive contrast to the edges. In case you can't tell, I like the stuff.
Dennnis