I don't like pencils, for my vision the color is too low contrast with the paper compared to black ink, or even blue ink, and for that reason I prefer a .7 nib to a .5, the thin lines also result in less contrast (they also make a scraping "sound/sensation" on the paper). but I didn't comment just to say that, but I selected your comment as a representative sample for a broader comment:

hey everybody, could you tell us why you like something rather than just that you like it? We had a mechanical pencil recommended, and then two more mechanical pencils recommended, but I'd have to do my own research to figure out why I would choose one over another. Whereas, you all already know what I'm looking for in a writing implement (high contrast and maximum smoothness)

even though I don't think I want a pencil, I do have opinions about mechanical pencils, for example I love when they can autofeed new leads.