If its not required its not necessary--however, I've noticed that come exam time it seems those that type (assuming they can type faster than they write) seem to have an advantage. There's a lot of info to get out on an exam, and its hard to handwrite it all (we had people who handwrote first quarter switch for second and third to computer, and they agreed it made it easier). But if you aren't a good typer anyway, you'd probably be more comfortable handwriting your exam, and you'd have no disadvantage. I would suggest, as TAS21 did, to have a computer available for you outlining though--I couldn't imagine if I made a handwritten outline, decided I didn't like the organization, and having to write the d**mn thing all over again!
Laptop is essential in law school. I would go nuts if I would not surf the Internet during the entire duration of the class so that I will not pay attention to the crap the professor is saying.
Even if you will never outline or take a single note on it, you will likely use it for writing assignments, and you don't want to be stuck at your apartment/house or screwed because you can't find a computer on campus.