Couldn't connect to my wifi whatever I did (using the captive portal), until I re-flashed the firmware. The flashing blue led on the ESP8266 is really distracting, I had to unsolder it. Reflashing the firmware needs quite a number of libraries, which are not all listed in the documentation, but reading the source is enough to find them. The board is fine but would really benefit from mounting holes. I printed myself an enclosure and I'm happy with the final product.