This CyberPower Standby CP550SLG 550 VA Desktop UPS is very nice. This is their newer model that connects easily with a USB cable to my iMac and I don't even need to load any software. This model works off Apple's built-in power management software. A few quick clicks and my iMac controls the UPS backup should the power go out. Power goes out, the UPS talks to my iMac and tells it to shutdown. What a great safety feature vs. just letting the battery runout. This UPS battery backup also comes with a CD of software to operate a PC. I'm very pleased. In addition, this model is Energy Star compliant. Nice touch!