I have a clump (Mars) that has not been divided for a couple of years and is now filling an 8" pot. I like them when they get really dark, so I'm moving mine to full sun this year. The past two years mine have been in a little bit of morning sun then a bit of very late afternoon sun.
Speaking of heuffelii, I really like heuffelii 'Kapo'. It's small, but it is very well behaved, which makes it beautiful. Here's a pic, but you cannot tell it's charm from the poor image. I'll have to try for some better pics.
Also, anybody note how closely heuff. 'Sunny Side Up' and heuff. 'Sundancer' look alike. So far, I can't tell the difference. heuff. 'Fandango' has a similar color scheme, but seems to grow larger rosettes. I'm going to put these in the sun and see what develops.
Jovibarba heuffelii 'Kapo', Jovibarba heuffelii 'Sundancer', Jovibarba heuffelii 'Sunny Side Up'