Trex Yacht Club rocker

Trex Outdoor Furniture Rocker Stepping

I've tried a lot of different carpet sliders over the years and so far the Waxman brand is way ahead of all the others for providing sliding surface that works even after a piece has set for a long time in one place and sunk into the carpeting. The other brands I've tried work when you first put them on, but once the piece sits in place and sinks into the carpet pile, they don't have the ability to climb out of the sink hole, they dig in and the piece might as well have nothing on the bottom. The curved edge of the Waxman design allows it to climb out of the sink hole when you push on the furniture.
These sticks are the only solution I've found that works when furniture doesn't have distinct corners or legs to use triangles or circles on.
If the piece is a heavy bookcase or big desk, be prepared to use a lot of them as each stick doesn't provide a lot of sliding surface, but when there are enough of them the heavy piece will move easily.
About the only con I can come up with is not to use these or any Teflon slider on hard wood floors. They tend to pick up grains of sand or whatever is there and scratch themselves and the floor. These are for carpet only, Use felt pads on hard wood. But for moving on carpet, these things are second only to having someone else moving the furniture for you.