I can't figure out why that one is more expensive, the 1500 seems to me the better one at minimum because of more outlets, more output, and it puts out a true sine wave power. I just got a comparable model at Best Buy for about the same price. (Also got a smaller backup to put the modem/router on). Either way, Cyberpower looks to be the best manufacturer to go with, APC has a lot of negative reviews compared to them. I used to have a APC long ago that did fine, but that was then.