Welcome to the forum ! They are good tractors,if they're cared for. They are the smaller version of the 300/400 series,and are quite capable of doing mowing,plowing,snow removal,etc.,when set up properly.
It should have the Kohler k301AQS engine,which is a pretty reliable engine.
Parts are pricey,simply because they are John Deere.
Make sure,if you get it,that you get any attachments,manuals etc.,that go with it.
What kind of price do they have on it ?