Pros: Secures doors and stops would be thieves. Looks good and isn't really noticeable.
Cons: The ones for my YJ required me to remove the lower windshield hinge bolt, so I had to pull out the dash and bend my wrist to loosen it. Not a hard install, but it took longer than I expected.
If you have a set of full steel doors, then these locks are a must. A set of full doors in good condition are worth a lot, not to mention they're easy to remove if the thief knows what he's doing. I got mine new of eBay for pretty cheap and have been very happy with them. I would highly recommend these locks to anyone who wants to make sure no one walks off with their doors.