I had a Pico and I wanted to make a, well 4, sensor circuit(s) for my model train layout
So I soldered on pins to my Pico and plugged it in to this Pico Base, so easy.
This is the best accessory I have ever bought for prototyping, just can see everything and so simple to connect to my breadboard with jumper wires.
It also has a lot of additional plugs but I did not have those connectors.
LED status for every pin, I think; No messing about with discrete bits and bobs. Also easy to clip on my scope. .