The first battery I received with the unit lasted nearly 2 years. However replacement batteries have been dying in months, the most recent one only two. I am changing brands, even though I purchased a spare backup battery.
The unit is very sturdy and looks nice on my desk. I've also installed the PowerChute software and connected the unit via USB to my computer, which has a nice dashboard that allows me to monitor the system and change the configuration. My only criticism of the unit is that it's a bit loud -- it makes a constant humming sound. You don't really notice it if you have other audio going on, but in a quiet room it's definitely noticeable.