Product review (5 stars): Great replacement for wire nuts
I've used these Wago Lever-Nuts extensively over the past several years, both at home and at work. I would venture to say that these are one of the greatest product innovations in the electrical wiring arena. The key feature is that individual wires can be inserted and removed easily without disturbing the others--not so with regular wire nuts. Usually when I try to explain this product to others, they think I'm talking about the "stab" type wire connectors that are available at your local Blue or Orange store. Those are completely different--it's almost impossible to remove a wire once you've inserted it.

Pros:
* Use any combination of stranded or solid wire, 12-30awg.
* Wires can easily be inserted and removed, many times if necessary. The cage clamp mechanism is very strong and doesn't seem to wear out even after many open/close cycles.
* High quality, solid construction, very suitable for industrial use.

Cons:
* A bit bulky when compared to traditional wire nuts, although I don't know how it could possibly be made any smaller and still have the same functionality. There have admittedly been times when I've had to revert back to regular wire nuts due to space restrictions.
* Specifications claim it works with 12-30awg solid or stranded wire. This is generally true, but a 12awg solid wire barely fits, and if there's any burr at the end it has to be filed down first. I probably notice this problem more than the average user since my house is wired completely with 12 gauge Romex.

Cost is certainly higher when compared to regular wire nuts, but that's to be expected with a more functional product. I don't know if I could justify wiring an entire house with Lever-Nuts, but for remodel work there's no question. I always keep bins of the 2, 3, and 5-position connectors close by when doing electrical work.