Great buy, you won't regret it as long as you're willing to take the time to learn them. Does the display say that? I've never had to update the firmware or hook either up to my computer and they work perfectly well. I have one older model and one brand new model. They changed the interface slightly about 2 years ago.
Here's what I do with my RKL (let me know if you want instructions on how to set it up):
-monitor temperature with the temperature probe and have an alarm set if the temperature goes below 72 and above 80F
-Turn off the heater if the temperature goes above 80F
-Control my 3 part dosing (Mg, Ca, KH); program them as if they were "lights"
-Monitor pH and have an alarm set below 7.8 and above 8.6