I've grown my D. regia for over 7 years and it's been from Cali, to Brooklyn to a few places on Long Island and it's flowered... cool temps are important. constant 80F heat will kill em. They seem to love it in the mid 60's.
I use a perlite/peat mix that's pretty loose and I don't over-water em and I do not let the media get all water-logged. Bigger ones can get thirsty, soaking up lots of water. I kinda let them soak up their water and then add more...
I use florescent lights and they love em, although when they do get sunlight the dew will get much more gobby.
The bigger they are, the less they like repotting. They do spring back though.
They do well in basements under lights... if your conditions are right, they can be pretty easy. If they are not right, then they will be difficult! Sure they might be able to survive 90F heat for a spell, but for an entire summer they won't.
D. 'Big Easy' are definitely more tolerant, but not bomb-proof.
These are great plants and can get quite large. One of my favorites!