Indeed it is easier than Worsleya, at least for me, but I am in tropic, so it might be the reason that they are easy.
I grow 3 sp of Griffinias. I used to have Worsleya too, but lost it among lots of plants due to neglect.
However Griffinias survive the abandoned garden, they are tough. Grown in ordinary garden soil. Nothing special.
Below are pictures of them blooming under severe drought, just to show how tough they are.
G. liboniana
G. Espiritensis
G. Aracensis
I notice from your previous post that you grow Hippeastrums well. So I believe Griffinia will be just grow great with you.
I found G blumenavia (Eithea blumenavia) as tough as other Griffinias too.
