I play all different instruments: Bb Trumpet, Eb/D Trumpet, Piccolo Trumpet, Flugelhorn and Cornet. I had recently purchased a Long Model American style Cornet and wanted a mouthpiece that matched all my other mouthpieces that I use for all the different instruments that I play on. This one - the 1 1/4c is a match to my Denis Wick 3 size that I needed.
The cup is quite deep but not too much and it gives an excellent tone on my new Cornet. It was very easy to get used to. My range on the instrument with this mouthpiece is amazingly large. Can get right down doing pedal C's and right up to super E's.
All in all, I'm very pleased with it. And a big thanks to Thomann for their excellent (as usual) service.