That's very similar to the one I am pulling on my current ride. I am very happy with mine. Except for the ~6mpg difference in mileage, I can't tell it's behind me. I did replace bearings and buddies, tires, the pneumatic arms, completely replaced the wiring, put in all LED lights and painted it to match the bike. I think I originally paid ~$500 for mine, too.
If I was in the market for a trailer I would say it's a deal. I have a much older version, top lifts from the rear, and all I have ever done to it was change tires and repack wheel bearings. Add a cooler rack and a spare tire and you are ready to go. Mine really pulls easy and the individual wheel suspension handles the rough roads just fine.