I have the Reef Keeper Elite and have not had any problems. They have great support through their site and the number of modules keeps growing. Once they get the network control feature out, that will close the final major functional hole. If you look at some of the modules on the way, it seems very likely they will soon be miles ahead of Neptune in terms of what the system can do. I like the fact that it is a new system just beginning to show it's potential (which yes does mean some bugs can still show up from time to time). I'm sure the Apex is great, but as far as I can tell it's basically just repackaged old technology put in a box that looks like the RKE.