I have used both Boos Blocks & Michigan Blocks, and much prefer both price and feel of the Michigan Maple. My favorite, it is a 15x20x1 3/4" with a Negaflex adjustable cutting board frame.
I've had the michigan cutting chopping board for a few months now. I use it mainly for chopping herbs, veges and kneading dough. I oil it up with mineral oil once a month and is getting a nice dark color.