Bests & Worsts Reviews from Amazon

As others have said, they're far too wobbly - to an extent that they could be considered "not fit for purpose". The springs fit nice and solid, but there's far too much slack between the springs and the posts. Also the "female socket" is useless. It cannot even take a banana plug of the same design. Also, it is the same hold used for the wire. Clearly whoever wrote this in the description never tried to actually stack these connectors. I'll try the suggestion from the other reviewer of soldering the springs, but these are very disappointing. Nice solid feel, but clearly the designers never actually tried to use them.