“Works great when used to remplace an established Pi zero in a project requiring wifi that used to work with an external wifi dongle in a headless configuration. I just removed the SD card from my already configured Pi zero and plugged it in the Pi zero W and it boots just fine. I was expecting troubles (especially in headless...) but it all works great and I could login using ssh via wifi. The Pi zero W seems to draw around 2W booting and 1W when not much is happening. With fine to medium wifi signal quality and running MJPG-Streamer using a raspicam (CPU < 10%) it still draws around 1.5W for me.”
