Contains the only fantasy trap sequence I can think of in the franchise. Probably one of the few Tobin Bell-heavy installments besides II and III, possibly JIGSAW. It's a little more unique in that it doesn't involve cops in any measure compared to the rest of the series. The focus on Kramer's medical providers really helped keep a focus that the aforementioned JIGSAW film couldn't. Possibly John Kramer's own DIE HARD, just SAW-flavored.
This more than certainly earns its place in the next SAW franchise rewatch. I love the bizarre flow this franchise churns out. Such a SAW bitch.