Hey Daniel,
I just plugged in my Reefkeeper Lite today that I got from another MTRC member. I will say that it was fairly easy to set up my light timers and calibrate the itemp probe. I still have to figure out how to set up my heater and will probably update the firmware before attempting to do it. I'm impressed that this particular RKL has been through 3 owners and still operates well. I like the digital aquatics website and was able to find the system manuals on their support forum. I'd say it's a toss up between the RKL and Neptunes Apex Jr...unless you have mega bucks and go for the elite versions of either. There is another controller out there that is very code user friendly if your into custom codes etc...can't remember the brand right off. I can't really give you an opinion of module usage, pump control, PH etc as I haven't experienced these yet, but so far I like the RKL. Those are my two inexperienced cents :)