I haven't but have had several friends that did it, however I was with them at the time of purchase. Most are happy with their buy. One, got an 7 year old SUV for $1200 that had a broken window (great buy on a rainny cold day), and have less than 40K miles. Recently another friend purchased a 10 year old Mazda van that have less than 60K miles, for $350, and it run perfectly with out oil leak (only required a new battery).