I love stirring the shit.
And I'm a skeptical cynic when it comes to brake pads.
I have used Goldfren from Ebay for the last 40,000 miles on my 1200rt.
Shit cheap, and work as well as anything else out there.
Just as with all the others, I change the rear pads with each new rear tyre.
Ride it hard, ride it slow, they work at least as well as any others, and last better than the original BMW rear pads do.
However, if you give a fortune for the BMW or Brembo equivalent, you will automatically convince yourself that they are: Better/have better feel/last longer/are safer. (Delete as applicable)
Myke