Not much experience on the 270, Helped a friend purchase a 00 250 for $12500 a year ago.
Cab and heat 2200 hrs, avg cond, poor tires. Some complain about not being able to see your rear tires when the boom is down, poor side visability until the boom is up some.
The 250 has a 3 cylinder engine that has a bit more vibration then it should, but this may not aply to the 270.
Jd make one of the most stable machines with more weight on the front tires when bucket is empty. Makes it easier to climb hills, as they can be much steeper b4 you have to turn around and back up it. They are also among the heavier machines for a given class.
Buddy has had no mechanical issues with his, they seem to be well built and typically 10 to 15% less then a comparable Bobcat. I paid @ 13k for my 00 773 with 1600 hrs a year 2 years back.