Bests & Worsts Reviews from Amazon

You have to do your homework and read the fine print on these. For example, 750 sounds like a big number, but that's the volt/amps and not the wattage, which is the number quoted on power supplies. The real problem is the Active PFC (Power Factor Correction) power supplies which have been required since July 2007. You can read about this in the FAQs on the APC website. As I understand it, the Back-UPS and Smart-UPS SC, are not true, pure sine wave UPS, and are not suitable for any Active PFC computer power supply rated 500W or more. This would include many Core i7 and older serious gaming machines. These bigger modern power supplies require true, pure sine wave UPS's like the Smart-UPS, Smart-UPS XL and Smart-UPS RT, according to the informative but confusing (to me) PDF that I downloaded from APC, Application Note #147. Of course, you need to calculate the correct load of your equipment to determine which model is suitable for you. I have several of these UPS's and they have served me well with my older smaller PCs, but they are not suitable for my new machines. They cut out and shut down my Dell XPS 435T with a 475W power supply. I should have done my homework and upgraded my UPS instead of using the one I already had. I still rate it 5 stars, because it does what it is supposed to do very well, if you choose the correct model for your equipment.