Correct. I may have a bad one (the guy in Britain as well). The 850 mA supply would not run it. It would not even do a hard reset. The power supply that came with it would give me iffy operation. It would seem to run but would not reset and reboot through the menu. Right now I have it running off a 5.25 (instead of 5) volt one amp supply in AP mode. It seems to be working.
The opensprinkler is running fine hooked up to my router.
Except for an allergy attack from running CAT5 in the attic crawlspace, I think this is a cleaner installation anyway.