Hi CGN .. m8 they are really brill - you strip the core to the designated length and just push the cable into the port and push the lever shut - its really good stuff, and those ones are rated at 32 amps.
Yes it really does CGN. The connection is maintenance free, and also you can use stranded with the 222's - forget crimps and stuff - its Wago all the way m8 tbqh, Check the Wago website for more in depth utilisation.
Yes you can re use them Tore although I don't know how many times - I usually buy mine from TLC, and also RS, and the cost is reasonable.