My son was struggling with his trombone because of the heavy Conn case. We bought this to make using public transport easier. Had assumed backpack straps would be his chosen method of carrying,, but actually the shoulder strap seems easiest as it's quick to pick up and balance - slightly more effort needed to put on his back, but the option is useful for longer distances. Straps dangle and get in the way when not in use - quite cumbersome to adjust, but once it's adjusted, it's solid and doesn't slip. Obviously for different coats/school blazer etc. some adjustment will be necessary.
Case seems robust and able to take the average knocks. Padding internally is infinitely adjustable and fits the trombone snugly.
My only real gripe is the fact the lid doesn't open up fully enough to lie down - it means one hand is holding the lid whilst taking the trombone out. I thought it was because the zip wasn't unzipped far enough - but even when jammed back as far as possible to the end, it still isn't quite far enough to open the lid fully.