Hey guys,
I just received the Mono case for the Prophet 6. I think its a great case that seems to provide the necessary protection to protect your 3k instrument. If you dropped it about arm height I think there would be no damage no matter where you dropped it. If you stepped on it, however, I'm sure a knob or two would break. If a guitar case fell on it, it'd probably be okay.
Just so you get an idea of what the product actually is, it's basically a Mono Vertigo 61-key Keyboard case. You have to use two of the included bumpers on either side to secure the Prophet 6 into place. There's a long padded foam bar you could use on top of the keyboard, but then it presses down on all the keys when the bag is zipped closed. So I removed it. You'll also have an extra small bumper you won't be using either.
I thought it was going to be a form-fitted case made specifically for the 49-key Prophet, but such is not the case. All in all, I am satisfied with it and will use it with confidence.