I've not been around the 60 series, but I think the 80 series maintenance is acceptable with careful operation. However, just kicking the pto in one time at full throttle with the rotor plugged will cost you $5K. When you buy a used machine of any color it is a gamble. The 80 series is very lightly built, that's a fact, but if you regularly fight mud like we do, that is quite an advantage.