Griego Mouthpieces Griego Artist 7C Large Bore

I am a relative beginner on the trombone so am only able to give a limited amount of feedback which will be of any use. I was looking for a mouthpiece which gives help to the higher register. It delivers in this regard. The mouthpiece is very comfortable, and gives great clarity and focus. Because of the shape of the rim, moving from one harmonic to another is (again, relatively) effortless. I do find the slightly larger throat, when compared with the Griego 5M for instance makes blowing more of an effort. In the hands of a good player, this would not be an issue. Unfortunately it does not make me sound like Joseph Alessi!