I don't know, Greg.
How do these devices really differ from them terminals in electronic lighting ballasts?
I've seen a LOT of them burn out in the last few years, wether by vibration or elevated ambient temperature.
The ad also mentions that when you use a stranded wire, you don't need to twist it up first.
How then, do you make sure that all of the strands are in the clamping part of the connector?
I mean, for something that has such low insertion force, it makes me wonder exactly how much pressure is on the wire itself, if it isn't enough, I can see a poor connection occuring.
I can see that these things would be pretty good for wiring repairs, but I don't think I'd use them for any new work.