Summary: This is a very good battery backup unit, but the switch doesn't always turn it on when you push it, even though it beeps, indicating you turned it on. Very annoying. I have the same problem on another APC model, too.
Excerpt: I think we just had a small test on whether or not this works. The power flickered and a message came up on the screen that AC power was restored. We had purchased the same model previously but it seemed to slow down the computer. Not being an IT person I assumed it was the backup.
Excerpt: The unit works fine, but I can only give it four stars. The reason is if you could replace the battery at a reasonable cost to extend the useful life of the unit and thereby reducing the electronic waste would be very good.