Each movie has been varied in its video presentation. Grain is likely intentional given how random it can be. Compression is a mild problem, particularly in scenes with low lighting. Sharp color maintains the director’s intent. If you’re looking for perfection, Saw doesn’t provide. That’s the source material, not the fine transfer. 
This is the first release of the series, special editions included, not to include a higher end audio mix. Usually a 5.1 EX or DTS ES 6.1 track becomes an option. Here it’s standard 5.1. That’s hardly a complaint with some pounding bass that’s a surprise coming from a dialogue-driven film. The surrounds are used to push various audio effects around the sound field in typical horror movie fashion. Screeches and music cues can be hard from all angles.
Overkill comes in the form of three distinctive commentaries. The first is the one to go for, discussing the new traps while tying the series together. It’s loaded with the director, writers, and executive producers. The second comes from two different producers who stay focused on the cast and their roles in the filming. The third feels redundant with the director, editor, and director of photography. There’s some discussion on shooting choices and story points, though it’s not information worth sitting through the film again to hear.
Extras follow standard Saw style. Both The Traps of Saw and The Props of Saw focus on their respective parts of the production. Props has a great look at the brain surgery scene. Darren’s Diary pulls some short clips together for a five minute look at what the director did on set prior to and during the shoot. There should be more here. Finally, five minutes of deleted scenes round off the disc. 
If past history is true, Saw III should be back on DVD shelves by the end of the year. Each film has received a staggering number of discs. This time, the unrated cut (which is likely the version they submitted to the MPAA seven times before gaining the R rating) is available right from the start. The extras will determine if it’s worth a purchase.
Article comments
1 - Chris Beaumont
I enjoyed this more than part 2.
Part IV was given the greenlit before III hit its second weekend, look for it in October 07.