I've had the APS J-15 for a week now.
Have had at least 3 brown outs (Voltage dips )since installing it.It hasn't gone into battery mode yet.It does, every evening go into AVR.
When voltage drops below 116 it bumps it to 224.
I unplugged it and it's very very quite in battery mode.
I have an HK 635, Parasound 1205A,Panny Plasma ,dvd and cd player connected to it.Wife says the Panny Plasma is brighter now, I can't tell the difference.Maybe I'll plug it back into the Panamax Conditioner and see if she can realy see the difference.
No complaints yet except for the ON/Off button light. It's big, and for me to bright. All other lighting on unit can be turned off.
The real hot season has yet to come, but with it comes power outages. When it does I'll know more .