I don't like the style at all. They are at the bottom of my list. I'd sooner cut splice and solder a hundred than use them.
I don't ever want to mess with a connection again once I'm done with one; that's how I grew to despise them, replacing them.
Tony's observation is much like my own... I just want to point out the radios aren't hanging by these wires. The weight of wire and connector alone, unsupported for 6-7", with vibration or without, this failure shouldn't occur imo. Wire nuts & a 3/4" stip of tape do a better, safer, job.
First off, any nick in the bus takes away from the gauge and lowers the power handling ability. If you use overkill in your gauge size it would negate the concern, but these things can shear multiple wire strands when installing, even sized correctly.
Second, they are prone to wire pull out and cold metal to metal connections (touching, but not conducting).
Third, wire creeping out of the V from insulation contraction is kind of common. Ensuring the insulation is pre- cut 360° so it cannot pull on the opposing side of the gap is my suggestion to stop it; don't rely on the connector to cut the insulation for you.
The WAGO style is a better choice imo. If a wire did come loose you likely won't even have to grab a screwdriver to pry it open, nor pliers to reseat it.
The positive lever/spring pressure is more assured with the wago's as well. The wedge's pressure may be higher initially, but that can be lost in many ways, copper migration, heat, vibration, etc.
(pressure contributes greatly to conducting power. It's presence decreases resistance increadibly, way more effect than a square inch approach for amps)
