To MPTtree, or not to MPTtree

[eluser]TheFuzzy0ne[/eluser]
I'm building a forum, and I'm wondering whether or not MPTtree is the way to go.

I can't see there being any more than a hundred or so forums/subforums, so do I go with MPTtree, or should I just create a library that grabs all of the forums/subforums from the database, or a serialized array in a file, and have my library handle things that way?

I'm interested to know what people think. I've heard a lot about MPTT, but I can't help thinking that it might be overkill with such a small amount of data.

Many thanks.