After 6 months with it, it is the sound I was looking for and I’m very happy with my purchase.
I use it with a Yamaha 891ZD mainly for jazz, funk, bossa, rock music.
I moved to the GP Nils L. from the slightly bigger Bach 6 1/2 AL. The transition was very comfortable since they both felt as very similar mouthpieces to me, just requiring a couple of weeks of adaptation to re-gain precision with emission and attacks.
It’s beautifully crafted and the gold-plating looks amazing: it is a pleasure to look at it, handle it, and use it.
Hope this review helps you, happy playing!