This is my first Jeep. Had it for about two months and have only had time to put a little over 1,000 miles on it.
No ticking, no leaking, no shifting problems. Not a squeak or a rattle. Averaging 19.2 mpg. Makes me giggle like an idiot.
I would advise new owners to put on at least a thousand miles before they get too concerned about anything. The few quibbles I had with mine when I first got it have all disappeared. It's now smooth like butter!