The Deblocking filter works great in reducing the appearance of JPEG blocks. Using FIVE means that I don't have to go through a tortured series of steps as described in Ski's article, with the accompanying mess trying to explain the steps to a jury.
Remember, with FIVE, you get the plain English explanation, the details, the parameters, and the academic reference from which the process/filter is derived all in your report. With FIVE, your report is built in the background as you go.
No offense to Ski. His company sells Photoshop plug-ins (among other things), so he's going to be bound to what Adobe gives him to work with. But, reading Ski's article reminded me how happy I am that I've switched from Photoshop to FIVE for my forensic science work.