I have kept up with this thread but please explain why when my business took a direct hit, it fried everything that was not on an UPS but turned on that day. Everything on the UPS came thru unscathed. I had $180,000. claim for our business. Insurance paid but demanded everything be put on the UPS system. I have lost equipment due to brownouts at home. We get them 3-4 times a week. Blows light bulbs, toasters, whatever is on at the time. They dim down then "POP". They are gone. I will stick with UPS as long as I am compliant with the insurance company, thank you. If your house or office is properly grounded then these devices are automatically grounded, "to the earth".