Hiya - I'm new here and just picked up on this thread as we're going through the process of becoming registered. We use Easi-Dec Solar-Dec the system and are just about to purchase second system as we're expanding well. We had a demonstration before we purchased which was free, and we honeslty wourlnt work off of anything else now. It's defintely the safest and fastest - hey maybe they'll give me discount off new order as I've said that! We also use their special roof hook with a kneeler board. Hope this helps!