yes, the P-Bone is not a toy or a vuvuzuela but a real trombone. IF this john packer TROMBA is made the same way (which is very possible) I would buy it. The P-bone is much more expensive and was originally sold (for 75£) by a British company which them sold their distribution to the Conn-Selmer group that has now doubled its price.
Of course it is a brass instrument, just as much as the saxophone is a “ WOOD”wind ;}