I agree that it should "revolutionize routing". I see it somewhat akin like the move from static routing to dynamic (protocol) routing.

Haven't used PfR until recently, and only now on one router (because of it being in the "T" train), but have used OER, its precursor, in a dual MPLS/BGP vendor corporate environment across about 50 sites for over a year.

Overall, the "pain" of using it offsets the problems that are otherwise almost impossible to easily address. The two big ones, when a provider black holes traffic, or when there's performance issue problems within one provider but not the other.

However, and noted above, there is "pain" involved. Many "gotchas" and the OER version, at least, doesn't seem to be mature with regard to stability.