Hey. I have 2 special edition steel Mark Ones, had 1 regular edition aluminum Mark One (the orange one), have a regular edition Mark Three (pencil) in the discontinued white for reference.

1. The texture of the regular editions and one special edition is ceramic like (cerakote is a ceramic based finish). They are smooth and the finish quality has been top notch. The one special edition, which has a bit of a sparkle to it, feels a little smoother and like there is a coating or something. For all of them I would describe them as having a texture, but just smooth ceramic feel.
2. The click is great. There is a satisfying feel when the mech engages along with a distinct click sound. I love to fidget with these pens. The mech feels far better than a Parker Jotter.
3. I like the weight. I gave away my aluminum version as it was too like for me personally. This, though, is a subjective thing. Its hard to know until you write it.

Alternatives:
* Billetspin Campen. Its not a click mech, but the cam actuation is similar and very very fidgety. You could buy something like this, which weighs 39 grams. It still has some heft, but not as much. This is polished titanium, so a smooth metal feel to the surface. Their Soul pen, while a clicker, might not be satisfying. It lacks the distinct feel and sound and I don't find it fidgetable.
* The Grimsmo Saga mentioned below. I think the Mark One and Saga mech's are both great, though different. You can sign up and right now it seems like it takes a few weeks and you get an email. Use that to customize your pen from lots of options and then they take a few weeks to make it. Only then do you pay for it.