Got on them all apart from BWP (Could of done if had wanted)
Used RnR for Studio 13, Saw Alive and Cabin. It seemed to work for us, longest wait we had was around 20 mins for Studio 13 which was better than the 60 min standby queue.
I think RnR has potential, I think there being 3 Queues (RnR, Fastrack and Standby) does complicate things slightly, if they could do fastrack only through RnR and make it 2 queues that may work better but could end up upsetting fastrack users.