The guy was not able to get it *completely* smooth again. It is just very slightly raised where the dent used to be. It's not noticable when looking at the car from most angles unless you catch it just right in certain light, but of course bugs me cause I know exactly where it is. :-(
Really depends on the dent. If yours was hard enough to take off the paint the PDR may not be able to completely fix it. Good luck.