I just got my first 3.
When I built up my 125, I did so with the discus in mind, It is plumbed into the house drain, and there is a 100 GPD RO system in the basement with a 65 gal heated storage tank, and a booster pump. doing a water change is a snap. and I can (in theory) do a 100% change every day (I mix R/O and Tap together to get a PH around 7.6)
To me they should be easy to care for, but I implemented some intense planning to get eliminate alot of the daily maintenance hassles..
I acclimated my 3 new discus, and within a few hours they were out and exploring the tank. they started eating right away.
They are a blast to watch, I have a 6" common pleco in the tank, and I dint think the discus have ever seen one before, they seem to be intrigued by him... they follow him all around the tank, just looking at him as if to say " what is that thing?"