In general this case is really nice. My only complaint is that the backpack straps are very thin, and are also attached a bit low. I ride a bike while wearing a helmet, and I have to loosen the straps a lot to keep my head from hitting against the top of the case while I ride. If the straps were attached at the top of the case (instead of about 15 cm down from the top, in vertical orientation of course), it would be much more comfortable to ride with.
Also, from the specs listed, I thought the internal compartment would be big enough to fit a Harmon mute, but it's not.