I would want to look it over very thoroughly. You never know what someone did or didnt do on equipment. It can look brand new on the outside but have been poorly maintained. I would look the tractor overy throghly for any bends, cracks, paint scrapes - looking for signs something - anything - could have happened. I would want to crank it up and listen to it, operate every lever and make sure everything works as it should. I would even pull the dipstick and check the oil, check all fluids, etc. If someone has maintained it properly and is wanting to sell it to you, they shouldnt mind you doing this thorough look over. Ive heard lots of stories of a deal like this happening then a week later the person who buys it realizes why the deal was as good as it was - and its rarely something good.