It's being used in really high end handbags and such already. It can be made to be surprisingly high-end.

Haven't looked too deeply at it, but from what I understand, it isn't durable enough for things like furniture. It's good enough for hand bags, accessories, and decorative features, but it wears out too quick for anything that sees a lot of friction like seats, clothes, or arm rests.

That being said, we are in the infancy of using mycelium as material, and what we've made so far is pretty damn cool. Expect a lot more things to be made of mushrooms as the technology develops.