I use this as a gig bag for my mic and music stand, not as a keyboard case.  I would have liked to purchase the GK-49, but feared that it would not be deep enough for all the stuff.  I like the internal straps so that stuff doesn't just drop to the bottom when it is tipped upright.  Because it is rigid, I can flop it over my bumper into the back of my station wagon and don't have to lift it very much.  It appears to be sturdily built and only time will tell if it is or not.  Really, it's basically just what I wanted, if just a bit long.