They are just great! They fit in my ceilings where we had old can lights when we moved in and they fit the holes snugly so no modifications to the ceiling were required. You simply connect the supplied lamp boxes with enclosed push-in connectors, then the lamps are attached with a screw connection and then inserted into the ceiling and supported by two very strong springs. And you can set them to one of three different color settings, and they can adjust their brightness too! what else to love