This case is great for travelling. It fits into an overhead locker as hand luggage, I've also checked it into the hold a few times and it's always come out the other side with my trombone intact!
It's very light given how sturdy the case is, and is very easy to carry using the shoulder strap. I never need to worry about my instrument in even the most cramped of dressing rooms, you can sit down on this thing and it's absolutely fine.
A couple of drawbacks, the design of the case means that you have to lie it down flat and open the zips all the way to open the case, which means you can't quickly get in there to grab something. When you stand it up on the bell, you have to keep an eye on it because it tends to wobble over a bit. There isn't much space inside the case for accessories, a bottle of lube and a spray bottle is about the limit and the zip on the outer pocket didn't last very long.