I have a WJ case for alto and the only thing I can say is that it's a great case. It perfectly fits your horn without internal movements and its built like a tank.
If you have the "Keilwerth one", I think that these are made for horns with big bells so if you own a Yamaha or a Jupiter, try better the Selmer/Yamaha one.
If you have the "Keilwerth one", I think that these are made for horns with big bells so if you own a Yamaha or a Jupiter, try better the Selmer/Yamaha one.