I got two of these batteries. These things do everything that they claim they will do. Totally awesome! I have 4 zr 600 a zr 360 and a zr 240...... Kicker....and a 275 amp altenator but even when I have the system as loud as I can go my voltage never really dips below 11 volts. Even when the stero isn't on they rest well above 14.4 volts. I've seen them as high as 14.7! I was hesitant to spend that kind of money on them but they are worth every penny that I spent! Just make sure you put a 500 amp isolater after the front battery.
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