Its never been implemented. I cant factually say it would be great, anymore than you can blame it for inequality. What I can say is that the inequality we see is a product of the system, and anarchy necessarily removes that system.
Again, I dont advocate anarchy, I'm just saying it is better than the other options listed. I wholeheartedly believe that concentrations of power ar emore dangerous than concentrations of wealth... and no they are not the same thing.
I honestly don't see how anybody could think that anarchy (or anything close to it) would be an improvement over the status quo.
If that was the case, why would people have bothered creating governments in the first place? Clearly there was something about pre-government society that was unsatisfactory, or people wouldn't have bothered.
And to be honest, when there's a power vacuum somebody will seize it, government or not. In the case of an anarchy (or even anarcho-capitalism) the most powerful people in society (either the richest or the ones with the most military power) are the ones who will do this. So really, anarchy is just substituting the rich/powerful for the government.