I really appreciate the convenience of this little board, and it's much better than an assemblage of parts on a breadboard. It's especially useful when programming a few ESP-01's in succession.
2018-10-01 : Still liking this board for programming ESP-01s. But I've added a toggle switch on leads with female connectors to replace the jumper. I've also drawn an arrow in silver sharpie on the top side to remind me which way the ESP-01 is supposed to face.