This product does work well, the lid does not fit a Trader Joe's peanut butter jar lid. The threads are just enough different that they start to go on then stop. I have found that the lid does go down far enough to use it if you are careful. The siring part works well and is easy to get the jar mixed without much fuss. The self-cleaning part is a bit of a joke. I take the entire lid assembly apart and wash all of the pieces. Still a lot better than trying to mix with a knife or fork or some other utensil.
Rating:
[4 of 5 Stars!]