I was bewitched by zBrush the first time I saw it. In comparison Max looks sloppy, always interrupting you with Menus. Max follows the graphical design tradition; zBrush goes the sculptures road.
That's what caught me with Vim.
Anyway, I found Sculptris, a one-man project. First time I use something like this, so I chose a simple project. A tooth. (I will move on to a fish...)