I used to have one. It lost time every day. I had to reset the clock on it every 5 days or so.
In any case, do you have the one that has the white, yellow and blue outlets? If so, you can't set the actinics to a different schedule than your daylights.
The white plugs are on 24/7 (for stuff like powerheads, heater, etc). The blue and yellow plugs are opposite each other. So if you have the yellow ones set to go on from 7 am to 7 pm, the blues will automatically be set to go on from 7 pm to 7 am. There's no way to avoid this, and no way to stagger actinics and daylights using this power center :(