If you play with breadboards a lot and try to build the latest coolest IoT device, this is a big help for the weird 8-pin ESP8266-01 - the one I do had my fair share of cheap and mislabeled Chinese connectors - it makes it SO easy to hook things up to the breadboard. I've even used it on a raw programmer for identical modules soldered together. It's easy to figure out which way things need to be plugged in, and debugging is just as easy thanks to labels.
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