That's a good quad and as long as the price is right, I would get it, Check sites like KBB.com for the resale value. As far as checking, you'll want to see how many hours/miles are on it if it has a display/speedo. Look at the overall condition of teh plastics, frame, tires, rims...to see how hard it was ridden. Check the oil level and condition. Open the seat and see what it looks like under there. Start it up and see how it runs. @Frank Angerano buys a lot of used atvs and knows what to look for.