Well It does not have supersteer, then of course it does not have autotrac, that is about 1000 more, (allows you to turn in 5 ft circle without brakes.) but all in all it looks pretty good, it is not a DA model, so probably wont have swivel seat, not sure about cruise control. But that said, it looks pretty straight for it age, and 600 hours isnt all that many. You might seriously want to consider this one. Just my 2 cents, but look it over good if you can.
James K0UA
As far as what to look out for, I cannot think of anything, besides the normal wear and tear items, if you want you might try to PM Jinman he is kinda of a NH expert. look for him here on TBN,. I owned a 99 tc33DA with supersteer and loved it. I sold it when I moved, but I really enjoyed that tractor. I love my new Kubota too, but that NH was first class.