I had my Roland PC-180A lying around and travelling with me from country to country for quite a few years now, without proper protection from impacts, dust, and humidity.
I literally stumbled across this bag while looking for something else, and decided to add to my order right away ... I admit, at the time I had no idea there were bags available for this size MIDI keyboards...
The bag is great, and for the price a real find, my Roland is finally safe and should last much longer. The bag does exactly what it is supposed to do, a perfect, sturdy protection, exactly what I need it for. The only (and I mean only) drawback for me is the depth of the bag, at least when it comes to my Roland PC-180A, it allows a little too much depth movement when placed inside the case (about 2-3 cm too deep). That is the only reason I give it 4 stars, cause I am not even sure if MIDI keyboards come as thick as this bag suggests.
Anyhow, I remedied that minor issue by keeping my old thick and soft cover with the keyboard, the cover which I used to (poorly) protect it in the past, cover it from dust/humidity while it was sitting on my desk, and being actively used.
Anyway, a great MIDI keyboard protection I certainly recommend. Just make sure you get the right size bag, as there are 2 models/sizes available, 49-1 (this one, 100mm deep), and 49-2, which is even deeper (130mm deep).