I breastfed my baby for several months and when I started introducing bottles, I'm a little stressed. Especially since the first time I shook the bottle full with milk, all the powder is deposited in the teat and I was forced to change urgently. I hesitated to buy the mixer because I thought that more than 10, it might be exaggerated. But in the end I'm VERY satisfied with my purchase. Not only it works great (I have not had any failure problem, just change the batteries regularly). The bottle is perfectly mixed in 4 seconds and I never had any lumps. The only drawback for which BEABA can do nothing, is that it still represents the extra dishes. But the mixer can be assembled and disassembled easily and there are just two small parts washing. I suggest this little device for those who want to prepare quickly a perfect bottle for their baby!