I bought the 300 U I was looking at and so far no major problems. It's a 56 according to the serial number but registered as a 57. Running good, drives nice( a little shimmy getting down the road in 5th gear), and just a few leaks to catch up on. There is a coolant leak at the upper rad hose, and PTO seal and right axle seal leaks. I put a small snow blade on that a neighbor was tossing out and knocked down some of our manure pile. Got some chains for the tires today and I am getting a truck snowplow with frame for it for $100 tomorrow. I will just put it on the back for this winter. Where is the best place to get manuals for these tractors? I want to have all of the info for maintenance and adjusting the clutch/TA etc.