Audiophile line conditioners are placebos to a problem that doesn't exist. Hopefully hanging around the Axiom forum can help you inoculate yourself against this form of marketing.
That doesn't mean line conditioners are useless. I once had a customer who was burning through PC power supplies and UPS's (uninterruptible power supplies) because a computer was located in the wing of a fabrication plant next to a giant metal lathe. It had to be there because the PC was running the beast. I convinced him to get an APC Line-R power conditioner to solve his brownout and over voltage issues, and voila, the issue was resolved.
I checked the APC site to see if it was still being manufactured, and not only did they change the design, but they dropped the price to a quarter of what it sold for a couple decades ago.
You don't have an industrial machine the size of a bus spooling up and down several times a day, so I don't think a line conditioner will do you any good.
