Originally got this for my Korg opsix. Fits like a glove, robust, gives some impact protection, too. And I can sling it over my shoulder when I go on my bike.
But in the end, I find myself using it for my Roland SPD-20 pro. The inner pocket has space for my sticks. It is in fact slightly too big for the SPD-20, but for some reason, nobody makes bags specifically for it, so I am very pleased to have found this. Yes, Protection Racket make a bag that they claim is for the SPD-20, but that bag is just crazy big, the SPD just swims inside that and it has no shoulder straps.