These Travalo- type atomizers work fine, but there is no way to fill them from a splash bottle, so I tend to prefer the other sort that you can spray or pour/pipette into. Also, you have to remove the little sprayer-knob from your full bottle to use them, and then the little knob may not sit right afterward.
One of our members found that her precious discontinued perfume evaporated from one of these when she was flying. Maybe their seal isn't so good in lower-atmosphere environments?