This is the best unit I have had so far, and I've had many. Quiet!! I never hear it operating. It charged within minutes of pugging it in. I have Win 7 64 bit OS, 16 Gb RAMM, Intel i7 860 2.8 Gb CPU (O/C to 3.5 Gb), two monitors, two printers, and several heavy duty computer components including two high end graphics cards, four 2 Terabite HHD's, and a 850 Watt power supply, it handles it very well. To test it, after it was fully charged, the indicator claimed a 12 minute operating time before shut down, with a video playing in HD (to load up the graphics cards), both printers on, and both monitors operating. I unplugged it from the wall socket and started the timer, it ran 11 mins and 45 sec's then shut down my system. I couldn't be any more satisfied with this purchase, hands down! It is the best I've ever come across.
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