When done by a quality technician, this process is the closest you can come to the dents never having happened in the first place. Both the metal and paint are put back to pre-accident condition.
Because the original factory finish is preserved, there is no need for grinding the paint off, and filling the dent with bondo, primers, and sealers that are needed with conventional body repairs. PDR is also 100% environment friendly. No chemicals or other toxic materials are used in this process.