Gee, now that I think of it - I've grown quite a few succulent type plants for many years without any problems (Hoya, Kalanchoe, Aloe, Haworthia, and I had a couple of large specimen Euphorbia tirucalli (Pencil Tree) for quite a few years but they ended up being killed by 2011 winter freezes.
I wonder why I've had such bad luck with other succulents? I need to think on that awhile, LOL. I grow everything in a loose, fast draining potting medium so I should be able to grow Echeveria, Adenium, Sedum, Graptopetalum etc., don't you think?