I still haven't used this type of "wire nut, I've been "sold" on good ol' B-caps for a while... and after seeing my share of burned up recp's due to the "speed-wire" installations, I was VERY sceptical when the guy at the counter showed them to me. But as has already been said by someone, the "Wall-Nuts" I looked at, and even went so far as to take apart, do indeed seem to be far better than any recp "speed-wire" ever dreamed of. The spring doesn't take the current, the plate it presses the wire to does.
I still like a good twist on the wires with the ol' linesman pliers, and a wire nut best, but I'll give the "Wall-Nuts" a good second for looking like they work well.
