I'm one of the earlier RKE users. I've had a few minor issues with the earliest FW that were all quickly sorted-out. All-in-all my RKE has been very stable and perfromed extremely well. I had a small issue when updating to 1.07 but after a minor panic got that resolved as well. IN addition to the basic setup I added another PC4 and another SL1. In addition to running my lights, lunars, fuge, it controls my skimmer, return, closed loop, ozone, heater, fans, Ca Reactor CO2 (pH), and ATO. It also monitors system pH. I love the RKE. Can't wait for the new modules.