While I think the benefits are great. When used to support an officer's actions, decisions or behaviour.
The negatives for such would worry me though.
We are already in a culture when an unconnected superior can dictate judgement from afar, and after the fact, and with hindsight.
Imagine if you will, a scenario :
An officer is in an altercation with an unpleasant member of the public (For this example, we'll use the vernacular "Scrote"

)
Tension rises and a scuffle breaks out in which the officer responds with a hefty hoof to the clackers and a frontal lobe collision 'pon the nostrils of said scrote.
Now, most sensible and right-thinking citizens witnessing this would view the response as perfectly justified in order for the officer to execute his duty.
A week later, said scrote files a complaint, regails the tale of defending himself against an aggressively attacking officer.
Two sides to the story, and if the truth of events be on the side of the officer, it could still easily be argued and convinced the other way, even with video evidence.
Independent commissions, panels, and police superiors review the information they have from the safety and comfort of their warm offices and with the benefit of hindsight. That's not to mention any ulterior motive (for example, PR, pressure from above....cost cutting etc etc)....as a result it's found the officer was too aggressive and he has to suffer whatever consequences follow.
The officer knows he was right, witnesses know he was right, even the scrote knows he was right, but the interpretation of the situation by those after the fact may be contrary to what really happened.
tl;dr >
Scrote is a scrote
Scrote is being scroty
Scrote needs slap
Copper slaps scrote
Bystanders cheer
Scrote complains
Copper says "he deserved it"
Bosses watch video
Bosses go "Nope, that wasn't very nice....you're fired"
Thats a hell of alot of waffle there actually for a simple explanation
