I use wood exclusively. I have an 18"x24" maple wood John Boos Board that is on my Kitchen island at all times (so no one does something stupid like cut on the maple top of the Island). Then a selection of smaller boards, my favorite being a bamboo board from Shun.
The Maple Board had started to split at the ends during the winter, but those have closed up now (same with my Pizza peel). The bamboo board seems to need less maintenance. I probably oil my boards every 3 or 4 months as opposed to the 6 week reccomended intervals.
At my school and most restaraunts they use plastic or some sort of hard rubber, and your knife really digs in to those. I have seen slivers of the board come up from the tips of filet knifes when fabricating fish.
A good wood board can be sanded down when it wears out or starts to dish. Plastic are just garbage at that point.
Spicewine Custom Medium Large (Thank You Sawdustguy)
Primo Oval (and BBQ Guru for when I need a nap)
ECBrinkmann Vertical Smoker w/mod charcoal pan and thermometer (used mainly for storage)
Meco Aussie Walk-About (AKA the princess grill)
Klose 20x30 Smoker (sold)
Thermos Square Grill (abandoned at Giants stadium)
Kenmore/Charbroil Gasser got dragged to the curb