This dust cover is Perfect to protect my Native Instrument S88 MkII keyboard. The dimensions are nearly perfect, there's a bit of extra space, but the strings can be pulled to really tight it around the keyboard.
I'm using the cover as a cover, not as an air tight wrapping. So the extra 3-4cm are enough to make the dust cover get on and off of the keyboard very easily.
The Thomann logo is quiet subtle, and doesn't come out as an eyesore ...
So if you're looking for a nice cover for your expensive NI keyboard : take this one, it's perfect.