Yeah the keys are nowhere near as good. :(

Isn’t it? In what way?

I was just about to buy one but I still have my original 15c and thought it would be good to get a new one.

Well, my re-release is the previous one (“Limited Edition”), so it's possible this is different. Mine actually rattles, and the key feel is inconsistent.

I'll skip it then I think, this 15C will probably outlive me anyway.

Double shot keys?

Painted. Probably these are the same platform as the current HP-12c incarnation.