Look for reels that are not covered with scuffs and nicks especially on the rims of the spool and frame. Be sure the reel you are about to purchase has no wobble as the spool turns and that it does not contact the frame in any way when turned. Please do share your thoughts as well.
When buying a used reel, you can save yourself lot of headaches by making sure the condition of the reel. If possible open the reel and look at the gears as well. Make sure you don’t hear any abnormal sounds. Make sure the drag functions as it should. Go for used reels only if you get a good used ones. Otherwise it’s just not worth it.