wacom. wacom. wacom. i own three. ive used one probably every say since like 1999 or so. once you get used to it, youll never go back to a mouse. its definatly not the same as pen and ink and a scanner, but it certainly makes things alot easier once youre past that stage.
It's just a tool. It doesn't make designing any better. It just helps you do what you already do. I like it because I feel I can be more precise than using a mouse. I am used to using a brush or quill so it's more natural to me to use a stylus pen.