Not bad but bring a checklist, or a mechanic...
Price is Fair but it should be looked over carefully as 1800 to 1900 hours is a key point when a lot of high dollar items will go. Check the feed roller bearings, main disc bearings and the yoke pivot. The Wisconsin Gas is a decent motor but they are now obsolete since they are not made anymore, so parts may be and issue down the line, if your looking to run it for the long term and the unit is sound and worth investing in, look into putting in a 35hp B&S Vanguard, you will love your chipper after that. The 6" bandits are the only chippers with a large enough feed system to handle the extra power.
Generally speaking look over everything you can, things to keep and eye for are Air Filters (meaning regular care for this item) oil and hyd filters, hose and check the hud hose and fuel lines, the condition of the muffler (will go after 2000 hrs or so) and the condition of the fuel in the tank, meaning has it been sitting. Check the hydro fluids color, should be clear like new motor oil, it shouldn't look milky. That's condensation. Maybe you know all this but it sometimes helps to have a reminder.
Price sounds fair if all this checks out and she chips good, check the knives and make sure there is little to no play in the cutter bearing, also look to see if the bedknife is sharp and adjusted properly. Axles and bearings should be looked at too, check to see if they squeak or have grease.
That should get you started. Its a good year and make though.
Best of luck.