These soothers / dummies are a great little invention (i.e. the glow in the dark element), as long as you keep them near daylight / sunlight during the daytime. This is because they need to feed off the light in order to build up their "glow". As long as you keep them somewhere where they can "charge" up during the day (i.e. not in a drawer), then the glow feature works really well. Invaluable if you need to find one for your baby through sleepy, bleary eyes at 3.00am, especially without glasses on (as I tend to be in the middle of the night!).
As with all other Avent products I have purchased (including sterliser, bottle warmer), these soothers are of a good quality. They are also dishwasher-proof, providing you put them in the top section (I put mine in a pop-in basket).