Easy, solid connection.
Crutchfield Customer Review (What's this?)
These were easy to use, and make a very solid connection. I used them for car speakers and it was convenient not to have to strip insulation from the existing car wires since one of the connections (ends) pierces the existing insulation. The other connection requires the wire to be stripped, but the speakers came with wires pre stripped, so that was no problem. I would use these again.
Pros: Ease of use, solid connection.