I purchased this bag for my Kurzweil SP-4 76 as it was under half the price of their own bag. I simply took the measurements of my board and scoured through the bag section to find a good fit. My research paid off as it's a great fit for my board and should be suitable for most 73 or 76 key boards.
The quality of the bag is good and offers decent protection although I have taken a star off the for not being quite as sturdy as the Yamaha bag it replaced. The front pocket is large enough to keep all of my accessories (power supply, pedal, cables, etc) and sheet music. The best part has to be the price, you can't really go wrong at 55 euros.
I have been gigging with this case for over a year now and it's still in excellent condition with no problems what so ever. Overall I'd say it's of very good quality and excellent value for money.