I bought it for my Novation SL61mk3 and its a perfect fit for it.
It is very well made, and it looks and feels like it will last long under regular use. Has plenty of pockets to carry extra stuff. The biggest pocket easily fits 15" laptop, and have the two smaller ones on the sides for pedals and power supplies.
The shoulder strap that comes with it has a weird kink/curve to one side on the soft pad that lays in your shoulder, which I guess was supposed to be some sort of 'ergonomic' feature but it's the exact opposite in real life, since the whole weight of what's in the case ends up distributed to just one side of the belt, and it digs to your shoulder as a thin rope. So I have to carry it by the handle which has a hefty and sturdy feel to it.
It's a well made materialwise, probably it would last long time and if you don't have to use the shoulder strap, it's very easy to recommend.