I've had the Vector Sungenie system installed but on standby (two way meter was only installed this morning), but it came in real handy last night! Power went but we didn't notice until we went in the kitchen and noticed the oven clock was off :-)
Now the two-way meter has been in for 2 hours and the solar system was brought online .. and according to it I've saved $1.32 already even with the naff weather ... yay!