I know a couple of guys that are working towards certification in Haganah and from watching them I can say that the system isn't that bad. But let's be honest all the system has really done is borrow techinques from BJJ, Muay Thai, Escrima and a few others and tweaked them a little bit to it make it more "street oriented" and then taught it as Haganah.
I watched a couple of classes. I saw some of the same stuff I had learned in BJJ for their ground work, some of the same stuff that I learned in Muay Thai for standup, and some of the same knife defense stuff I learned in Escrima.
The POR thing is interesting and I will have to ask them about it next time I see them, but I don't equate Haganah as being revolutionary in any way.