the RKL is great and yes it is as simple to operate and yes you will be happy with it.
it is extremely expandable with up to 4 modules (2 pb4s 8 outlets and two modules, salinity, ph once you have out grown it all you have to do is upgrade to the RKE head unit and keep adding modules of your choice or just the Archon head which is compatable with any of the modules.
I have all of the products running on my tanks and the ease of its use from the rkl to the rke with net to 3 Archons.
support is great and updates are always occurring with better things on a regular basis.