I really enjoyed this. There was some over explaining to get points across, which I understand given the number of theories and diehards out there, but it made it a little heavy for the casual reader.
The math was the more convincing part for me, looking at the chances of all the ripper murders being on routes that he frequented, then also the chances of two serial killers working the same area (although this is not impossible and has happened several times).
I would've liked to have seen this split a little better, into:
1. ripper murders, who did it, timeline, evidence etc.
2. Then why the murders are connected to the torso murders.
3. Then repeat step one for torso murders. - but this is where it fell short for me, and I guess its because the location of the torso murders was never found. A great argument was made for the suspected murder house, but the layering of maps etc. that was done for the Ripper murders was not there.
Other than these points it was well argued and made for a good read if you are interested in the subject.