It's an old, high quality (in it's day), thumper dirt bike.
Might be a little long in the tooth for any serious distances. If it's low mileage and the valve train was watched/maintained well, the rotors still have meat, the calipers aren't frozen or otherwise suffering from being stored outside or "ridden hard and put a way wet" it could be a good bike.
The next generation 510 has a much better valve train that the TE630 inherited, too. Those bikes can be flogged for large distances.
Orange, it's the new black.