all brands have proprietary controllers including bt, not just the crown tsp6000. let's be logical. the tsp6000 has 8 modules, not 7. and so bob, please get the facts right. i understand the rr 5000 controllers problem they had was a one-off because they used a non crown controller and got into trouble a little bt which crown fixed once and for all. the important thing is that the access system has 3 years warranty and as far as i know, crown backs it up.