As usual, I would say to make sure shoot the bow to decide if you like it. Are you comfortable with a 60 to 70 pound draw weight? Is the draw length right for you? If not, a new Mathews cam will run around $80.00, they don't use draw modules on that particular bow. You can find used cams online for around $40. Check the serving around the cam, they tend to get worn out there. If it's seperated pretty bad, it would be time to change it, and you should be able to talk them down some. If I was going to check it out, I would measure the axle to axle length, and the brace height. At the very least, he'll think you know what you're doing.
I wouldn't call that price a steal, but I wouldn't say it's overpriced if it's in good shape. It fits nicely into the range of what those bows are worth. Mathews bows do tend to hold a good resale value.
Biggest thing would be to make sure you like that model bow by trying out the others you are considering.