The nib is lovely. It reminds me a lot of the nib on my Heritage 1912. A little bounce, very smooth, and good flow. I love that the threads are at the front of the section as it leaves a smooth transition from section to barrel.
Overall, I’m very pleased with the quality and performance. It’s just too small for me. If you can adjust to the thinness, I would highly recommend this pen. I think the Rouge et Noir is a great addition to the Heritage line and I can’t wait to see what Montblanc introduces next.