The funny thing about my personal view of the Sjambok is, pain compliance techniques usually suck. "Compliance" is an interesting word because most of the time, the person you are fighting has to be somewhat "compliant" anyway...in order to get things to work well with none of your teeth being knocked out.
The Sjambok offers astronomical amounts of pure, unadulterated pain...but unlike the electric pain of a closed ASP Baton or Kubotan during a wrist lock and roll...who are you going to punch when they are several feet away?
No one.
You cannot access them except to rush them and if you do that, you face a folder or something else that is nasty in their other hand.
So, in many cases, you can hang back and literally beat the piss out of an attacker who might not rush you because you have a CQC weapon in your other hand. Giving up on that, they might just tuck tail and run.
And the guy that can fight through the pain of a Sjambok dished out by someone who knows how to use one, I do not want to run into.