After 6000 miles, when my genuine BMW pads were half worn, the lining decided to leave the backing plate. First sign I got was no back brake followed by a nasty grinding noise as metal hit metal!
It is possible that this can happen to any manufacturers pads. Rainbow, however, replaced the pads free of charge (I didn't buy them there) and did a full rear brake inspection under warranty. Luckily there was no damage to the caliper or disc but would I have got this service if I'd put EBC pads in?
Mike R