You should try it sometime....if not, do you want to swap cookers? Mine is the same as yours...but used :-) You can pretend you didn't buy it because it looks nice...
... depends how much you fancy a stuffed mushroom jack. I don't mind spending the time on stuffing one properly and fully - for the sheer culinary satisfaction of the end product.
Oh, I like a stuffed mushroom as much as the next person...........it's just that I wouldn't waste MY time stuffing one (I'm sure that somewhere there's a klaxxon just gone off in the '.............as metaphor room' ) :o)