The rosettes should root easily? Just by putting them in gritty potting soil and wait? That's how I did them before and they just sat there forever and I thought they were fine, but when I went to put them in a container, no roots. Eventually they dried up. The squirrels don't care whether it's the right time or not to detach the rosettes.
I really have liked them. So far I've just allowed them to do what they wanted and haven't fussed over them, so they have made great plants which get a lot of attention when people see them. That one is just ready for some renovation and there are so MANY increases on it that I'm ready to do a bit of experimenting if I can get them to root.