Bought the M-Audio Keystation 61ES to upgrade my Hauptwerk virual organ to a three manual setup. I am pleased to say that the Keystation installed just fine, however, I'm not pleased to say that the 61ES feels like a hunk of junk plastic toy. The keys are loose and flimsy so I won't be surprised if they just break, and break real soon.I expected a more durable controller from M-Audio but you get what you pay for when you buy cheap.