Handheld saws cut from the underside of the workpiece towards the saw, functionally the dust collection on the TS55 is more like an under table shroud, and the TS55 has only a 160mm diameter blade meaning the tip speed and resulting air speed is lower than a typical table saw. In use the cut depth is commonly set to the material thickness or just over, so the blade gullets stay in the kerf rather than being free to throw dust everywhere. I don't know how good they are at capturing fine dust, but they do ok for the stuff you can see.