I don't think they are all that great for cars and would not use it outside of it. They are great for under a dash when you don't have any room or slack on the wires. Just get your pliers up there and pinch it on. They are used for a lot of auto accesories for this reason. Not a good enough connection for anything that matters on a car.
I have herd some swear by them for large ballest change out jobs.
Tom
