How easily are these boards cut into smaller dimensions?

I had no problem cutting this board into smaller dimensions. If you want smooth cuts, you need to use a fine tooth blade and painter's tape on top of the cut line (to prevent chip-out); I used a 150-tooth (plywood) blade in a 7-1/4" circular saw and cut it into 2 - 30" x 15 5/8", 1 - 17" x 15 5/8", and 2 - 3 1/2" x 17" pieces with a good size piece left over.