Very interesting. Almost two decades ago I bought a used Sound Application CF-X power line conditioner on Audiogon. It retailed for over $5K, I picked it up used for under $1K. At that time I was a fairly new "audiophile" and I was buying up all sorts of snake oil "tweaks": silver plated copper speaker wires, pure silver interconnects, Bybee AC filters, vibrapods, all sorts of different power cords, etc...
Apparently the Sound Application power conditioners are big with mastering and recording engineers (and Audiophiles ). They definitely offer better protection for your gear than a standard "surge protector", but $5k+ MSRP is pretty big leap if they don't technically improve anything.
I'd be interested to see a test of run of the mill surge protectors and power strips to see if they do any harm? Where is the sweet spot of protecting your gear without buying into the "audiophile tweaks" segment? Also, my understanding is that some of the basic surge protectors and power conditioners limit current and shouldn't be used with power amplifiers?
Panamax and Furman make some nice conditioners under $1K. Or is something like an AC Infinity (or any other brand) power strip with onboard surge protection for under $100 the sweet spot?