Demo Mowers.....what do you guys think about them? I have a chance to buy a Demo Mower that has probably 5 hours on it. The dealer said he would knock off about $300 for it. It's a 2003 Exmark Lazer Z HP. Should I go w/ a brand new one? Or should I take the Demo and save $300? Just wanted to know what everyone else thought about the Demo Mowers and this situation? THanks.