I run two Reefkeeper Elites on my two reef systems. They work fine, but I have serious doubts as to the future of Digital Aquatics. Their CS is not good, and they have failed to deliver on at least two promised defective product revisions (salinity probe and an SL2 module that really works) they have promised would be out for a couple years now. If I had known then whaat I know now IU'd have gone Apex, even though I cannot complain about how my systems are working. If you want internet capability, definnietely go Apex, s many RKNet users have had losts of problems.
I don't use the Net feature, and I had so much money in DA peripherals I went with another RKE controller when I set up my new system.
If I was starting from new, I would go Neptune.