We had a 6610 with Dual Power that I spent alot of time in when I was young. It was our first cab tractor on the farm and was strong for it's size. We had a loader on ours and was our main tractor for many years.. I miss those days..
Many summers spent baling with our 6610 and international 435 Baler. We did thousands of hay and straw. Always thought the dual power was good for baling