This works great as long as you have some common sense. It is plastic. That should tell you to run your drill slowly while mixing. As to the other review that states "they were covered in paint"... I find this hard to believe. Once you snap the lid on the paint container it is sealed. I did place my fingers on top of the two covers as a just in case but all the paint stays in the can. If you're painting multiple colors at one time I recommend buying one for each can. It remains sealed, when you get ready to paint you just run your mixer for about a minute and pour what you need. It really does work great, and after I had it on a can for 4 days it cleaned up pretty easy. Your drill doesn't have to spin at high speed to mix paint. If you think it should then maybe you need buy metal. It is convenient, mess free, and saves you from pulling a lid and mixing everytime you need more paint.