The only other thing limiting routes, besides what skirge66 side :P , is it's fairly large size. It's hard to get at places without a 3"-4" clearing sideways and 6"-12" clearing above, like near the inside corners of boxes. It helps to route before you put those pieces together. *shrug*
Example: The lines are peices of wood, the numbers spots trying to route.
| 1 3 |
|___________________________|
2
Spots 1 and 2 (from the underside) are fine. Spot 3 from the inside is too close to the side piece. That's what the dremel is for.