I replaced a perfectly good Encelia farinosa (Brittlebush, Incienso) that had never flowered as prolifically as I wanted with Calliandra eriophylla (Pink fairyduster, Mesquitillo).
The Encelia was at times an inspired choice - it had a ~2.5' rounded growth habit with perennial gray - almost white- leaves that looked great in a summer evening garden. It glowed in the moonlight.
However, it grew a bit wide for the spot I had in mind and crowded the top and sides of the small sandy berm on which it was planted. It never flowered as prolifically as I wanted (I've seen specimens absolutely covered with yellow flowers) and then it recently seemed to be a bit in decline. Pruning could have addressed this, but ultimately I wanted a bit more architectural interest, visibility through the its replacement, attractive flowers, and the ability to use more of the berm on which it was placed.
I think that its replacement, Calliandra eriophylla meets those requirements. I've previously planted its larger relative, Calliandra californica, and it flourished in my garden against a south-facing concrete wall. C. eriophylla should be a bit more dainty and with appropriate pruning it ought to be a bit more open, sculptural, and accommodating to adjacent plantings.