I am currently looking at a used grasshopper model 1822. It looks like it has been well taken care of, and seems to run fine. It has an 18hp B/S twin on it with a 52" deck. My question is this: Is a mower this old (I'm assuming it's roughly 17-18 years old) worth the price of $2500.00? Any thing I should be looking for specifically while testing it out? Thanks for any advice.