I am looking at purchasing a used (2004) Dixon 4423 zero turn mower. The seller says it has around 150 hrs and is in excellent condition. It has a 44inch mulching deck, with gator blades. It also has the 15.5 hp Briggs and Stratton Vanguard commercial engine. Wants $1600. Is this a fair price? Is this a good mower.? Am looking for a good mower to mow 3-4 acres (as quickly as possilble.) Thanks.