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I wanted a fanless UPS to back my NBN router + switches. I had calculated that it should last about 45 minutes. Even with nothing connected to the unit, it reports a 14% load and give a 40 minutes battery life.
Once I connected all I needed (a 24 ports gigabit switch, asus router, ATA etc) the load reported is 16% with a battery life of 35 minutes. So the reporting isn't accurate, but it did last that long during a test.
The unit is sturdy, there's no fan and you can disable the alarm when the power is cut (important as it lives in my son's bedroom)