Jayco generally has had a good reputation for quality.
Since this is your first RV of any sort I am glad you are buying used. Keep the costs down. That way if you hate it you can sell in the future with less loss.
One suggestion I would make. Go out and sit in the RV for a while. Get rid of the salesman and pretend you are actually living in it. Try taking a shower, making a meal, eating the meal, watching TV, basically living in it. Then decide if the floor plan is right for you. If there are too many hates, walk away and keep looking. If you have more likes, then make an offer. What ever they are asking, start at 60% of that number and work from there.
Don and Lorri
2007 Dodge 3500 dually