i am thinking about buying a john deere f687 out front mower for my acreage which consists of 4 acres. i now own a jd 400 garden tractor with a 60 in deck. i want to know if anybody has owned one and what the pros and cons that it has. is it better than the 757 or the777? i would appreciate any information that you commercial guys have on this subject since you do it every day.