These APC S15 units used to retail for $1500 back around 2005. They were highly reviewed, and I believe on a Stereophile recommended list in 2011. Battery backup, true power conditioning, including increasing voltage when the line voltage is low. Heavy duty surge protection as well.
There are a ton of inputs, including coax for cable, so could help out with grounding issues in A/V setups.
I got in on the Vanns blow-out sale a few years ago, and it was a fine unit for me for a while until I upgraded to an Uberbuss. It's a shame for it not to get any use.
Sold