The 90S/Stella/Stargazer's nib is different from the one in the Metropolitan. It is a 14k gold nib that is of a similar type to the ones found on the Pilot Custom series (Custom 74, Custom Heritage 91, 92, etc.).
Writing experience with this family of nibs is quite different from the writing experience with the Metropolitan steel nib. These 14k nibs tend to be significantly wetter and a bit broader than Metropolitan nibs (so a Stargazer medium would be a bit broader than a Metropolitan medium, for instance). Also, these 14k nibs tend to be a little bit springy, just a bit, they are certainly not stiff 'nails' like the Metropolitan nib. The 14k nibs also tend to be very smooth, I would put most of them in the "almost buttery" or "entirely buttery" category of smoothness. Whether that is a good thing depends on your preferences (e.g. if you like a bit more feedback with your nibs, these might be too smooth for you).
Edited by KLscribbler, 07 August 2016 - 14:59.