Bests & Worsts Reviews from Amazon

I recently purchased four of these units. I've encountered the following issues: (1) CyberPower's published specs for this unit can be found at https://images-na.ssl-images-amazon.com/images/I/91XTH5O0b8L.pdf. These specs indicate that this unit should be able to power a "Desktop PC + 17-inch LCD monitor for 90 minutes". Such a configuration draws about 500 Watts of power. I used a test configuration that draws only 180 Watts (measured with a power meter). Such a configuration should run 2.78 times as long as the 500-Watt PC + monitor configuration, which works out to 250 minutes (4 hours and 10 min). In my tests, the actual running time was 40 minutes--about 1/6th of what CyberPower advertises. (2) Whenever I cut the power from the mains, my digital alarm clock begins running roughly four times as fast, i.e., the time advances by one minute roughly every 15 seconds, which defeats the whole idea of having backup power for an alarm clock. If you are looking for a high-quality UPS, don't buy one of these. 2018-01-26 update: I called CyberPower Tech Support on Jan 26 and spoke to someone by the name of Peter. Peter disavowed the information in CyberPower's published specs. As per Peter, the actual running time for the desktop PC + 17-inch monitor is "about 6 minutes". Will CyberPower's published information be corrected? "No". When I mentioned the issue with the alarm clock, he claimed that the clock must have been badly designed.