what year and size? Either way, there's no way it will be too small, unless you're six feet tall or something. His smallest size is a 112, which is roughly 43 inches, which is on the larger side (these days).
Overall, it's not going to be a BAD board. If you're not a heavy wakeskater (heavy as in, the wakeskate is your primary board), it will be fine to tool around on, whether it's from 03 or o6 becuase it's going to last. The boards from 03 and 04 were a bit lighter (which isn't always better for wakeskating), and one complaint tends to lie around the sharp edges (when it came to the hyperlite boards). I can't remember how they've modified brian's board over the years...I'm pretty sure they got rid of the step down rail and they gave it some weight (and possibly more concave), and those modifications would have been made in 05.
If you really get into wakeskating, you'll find that people prefer different materials and things like that, and it's something you'll figure out as you progress and get the chance to try out different boards and designs. But 100 for a start-up concave is a good deal, because that's what a brand new flat deck will cost.
Identification:02= a wood board
03=the point of view graphics with the bird on the 112 and the fish on the 116.
04= point of view graphics that were inspired by mexican movie posters.
05: andy warhol inspired graphics. 112 will have pictures of his friends on it, and the 116 will have a bunch of catalyst logos on it.
06: two boards with argyle and different backgrounds. The 112 should have a white background and the 116 will have green.