The actual crisp is quite different, it's like a popped potato crisp. A cross between a normal crisp and a pop chip. Which is void of oil and could make a really good crisp.
But the butter tastes more like dirty, stodgy margarine rather than something you'd happily paste over your corn on the cob.
They're a pretty sickly crisp, and i'll admit that i'm not a mushroom lover, but even for a mushroom lover this is not what you'd want from a mushroom crisp. The butter flavouring feels like it's clogging up my lungs.
Japan, you crazy.