They're def a little more difficult to keep IMO. I've had best results keeping them under t5/ led combo. But, don't let that keep you from trying. They're an awesome zoa.
I'd say probably a bit harder than the common zoas. But not as hard as Flaming Mohicans or some other ones. They're probably equivalent to Darth Mauls or a lot of the mid range zoas in terms of hardyness in my opinion. They are also decent growers. My 1 polyp turned into 15 in about 6-8 months.