The last company I worked for was looking for ways to speed up work in a typical high rise. They were turned to these by the supply house. I tried a few connections and flat out refused to use them. The connections are such that ,in my opinion, a high load could cause a potential failure due to small area of contact between connector pressure point and the copper conductor. I would like to add that if you were to grab the connector and give it a tug it would pull off the wires. Try doing that with mechanically twisted wires and a wirenut.
