My experiences with Bach instruments... somehow, fate was very unkind to me in that respect...
My first ever "proper" trumpet was a Bach Strad 239 C, with additional slides for Bb, which I - as a total beginner - used as my primary horn. The C configuration was something I never used, and was the downfall of this instrument. My teacher at the time was a rotaries-only player, and then had to jump in at some musical production requiring a piston C. So he asked if he could borrow it for one day. No problem, except...
the horn was stolen from his greenroom in the theatre.
He was admirably insured, and I received the value of both a Bb and a C. I had caught the rotary bug and got myself a Ganter G5 and a Bach rotary C. That was a wonderful instrument, but still a bit too "pro" for me at the time. But - I did use it for a time, usually for Mozart masses.
Until my house in Ireland was burgled and that rotary Bach C was stolen.
My next Bach was a 37. Had it for about three months, and then, it was stolen from me in a tram... I was sitting next to the exit, with the case right beside me, and at a stop, a guy exiting the tram just grabbed the case and jumped off.
And my last attempt at Bach was a high-F that I wanted just to have the alphabet complete. One of those whims one gets. Had it ordered specially, paid through the nose, waited an ungodly time for it - almost a year! - and then it ended up in a freight aircraft that crash-landed in Frankfurt and burst into flames. Got my money back after more than a year's haggling with insurance but I never even saw that horn.
Decided that Bach somehow was not for me. Never had another mishap with any of my other horns... All other horns of my collection were not taken in that Irish burglary... even though they were on display in an unlocked, glass-fronted cabinet... the Bach rotary was half-hidden in its case...
C