I like materials that make my job faster, easier or that improve quality. Today I'm going to mention a product that does all three — G-aenial Universal Flo. Weird name, great product.
In terms of manipulation it is great. It doesn't slump, has beautiful flow characteristics and a lovely thin nozzle that allows precise placement.
It is universal and so does not require a layer of tougher composite over the top. It blends almost imperceptibly with tooth structure.
It looks incredibly good on radiographs.
Give it a try. I am almost sure that you won't be disappointed.