I have ran a 20' 750 for 4 years. I love the machine. We put a moniter on it and it works great. The only thing I don't like is it can be hard to set unless you know what you are doing.
The problem with the 1560 is the seed boot design and poor seed placement. They fixed the problem on the 90 series drills. The 60 series seed boot can be updated to the 90 series for about $100 per opener. So a 1560 with 90 series seedboots would be ok.
I would like to sell it. It is a 96 or 97 not sure, but anyhow it is the late model horizontal stripe 750. It also has small seed attachment. Excellent shape. Email me if interested. userysr@auburn.edu