I like these Wago 222-413 LEVER-NUTS 3 Conductor Compact Connectors 50 PK, and I have worked in the electrical maintenance field for much of my life's work and have done all of my own electrical work where I live.  These are not as hefty as the use of a wire nut seems to be more permanent, as I use them, with the solid wires twisted and secured, though this requires effort to remove and replace them.  Will they last, deteriorate or degrade?  Only time will tell.  They won't be around long in the marketplace if this comes to be, but for now they are a handy connector for use in 120 vac use and for wiring in the home.  I will use them for a while and if I feel they do not perform, I will revisit my review here and give the reasons why and lower the star rating I have given it.  If they outperform my expectations, I will also revisit and make changes that show the better performance.  For now, they are functional to make 120vac connections for the home and can be removed and reused.  They hold the wire tightly and securely and should provide a good connection for electrical use around the home.  We'll see.