I have five 3-post boxes and one 1-post box installed for ceiling fans and recessed lighting in our home. Extremely easy to install, they allow for oversized dimmer and fan controls, as well as flush mounting to the wall (where other boxes with "wings" securing them allow the large switches to protrude more). Retrofitting house wiring, I'll always use them Minimal drywall damage and a secure flush mount installation make them a breeze.