gchun

A couple of suggestions:

Bring a tuner. Test the intonation in differents registers at different volumes. Slow crescendos & decrescendo give you a feel for how easy it is to control the dynamics with different volumes.

Bring a recorder. Place the recorder at different distances. Record your regular horn also so you have a basis for comparison.

See if you can borrow the horn for trial at a gig or rehearsal. Also record that rehearsal.

Good luck,
Garry