As someone who has worked in a few data-centres, I can say I am very thankful for the wonders of a UPS. I have seen them save service following the grid connection browning out, and have also seen the UPS management systems die, taking out the systems they are supposed to be protecting, though that is more of a water-cooler story.
What surprises me, is how long I took to get myself a UPS for home, even though I knew the risks of not having a UPS, I could not justify the cost to myself, due to the limited risk factors with a personal PC and the UK power grid.
Though the other day, I saw a listing on eBay for a HP RT3000 G2 UPS, going to a measly £100, with recently refurbished batteries, so snatched that up, though the seller was selling the Network Management Module separately, for £90, still a good deal in all.
Well, I got this UPS back in December and it has already saved me, what is nice about having an over the top UPS like this, is that I can power the whole of my office and home network, and still have an hour of power at high load. I was gaming one-night last week, when the power on my street decided to go off, for checks UPS 3 minutes 24 seconds, during this time, I was able to continue online gaming with a few friends, with the only negative being the UPS fans kicking into high gear, though compared to most rack mounted equipment, I have to say the tone is a lot less annoying.
One thing I did not thing about when I got this UPS is that, it came with the added bonus of providing me nice insights into the power that is coming into my house. For example, this month, the UPS has switched the UPS Bypass and switched completely to battery three times, due to either frequency or voltage being out of what it considers acceptable ranges.
I was thinking of graphing the grid voltages and frequencies, but unfortunately the built-in logging is not the greatest, though it does have the option of daily email reports, so might give that a go further down the line.