One was little broken but fixed it by myself, overall pretty good:)
It´s very quiet, can´t hear the pump over the noise of the bubbles. I´m curious how long this little thing will last :D Going to buy more for sure. It has more than enough power for 1 small stone. Too little for a 60cm bubble tube. only 20cm will produce bubbles. But that's to be expected. It's so quiet i could sleep next to it.