Summary: I have an earlier model, I believe, of this unit, and in getting info on it I found various confusions between the models 600 and 1200. The same manual was used to cover both, for instance. The key components are a circuit board and a BIG HUNKIN' special type of transformer/inductor. This newer model may be made differently, but the manual I have lists the 600 Watt unit at 11 lbs, the 1200 watt unit at 15.5 lbs.
Summary: So far I am very pleased with the product. I am concerned with with condition of my power because anytime the power goes out at our home, I have startup issues with my computer. I recently got an expensive computer and do not want any difficulties with the power. I am glad I read the reviews because of the picture on the description. It looks like you are getting a two piece product but that is two conditioners stacked to show the front and back.
Summary: Had an issue with overvoltage that my utility company didn't want to fix. Fried a $400 home theater amplifier and had numerous other issues with sensitive expensive electronic equipment. Plug this baby in, set it to regulate to 110V and have not had a single issue since then. Cost is nominal for protecting $2500 worth of electronics. If I could give it ten starts I would!
Summary: This product is basically a box of wire with some lights on the front. I purchased this product to go between the wall and my UPS in order to provide constant line voltage when running on a backup generator. The issue was that my UPS was blocking its outlets when the incoming voltage was too high. The issue with this product is that it only regulates the voltage up or down when the voltage is out by either 6 volts or 6 % (I cannot remember which).