Very expensive when you look at the price tag but a CHEAP piece of junk when you actually get it. It works, admittedly quite well, and then after a couple of months, it quits. Mine were on surge arrestors, just in case, and died anyway. They will, enjoy the hassle, eventually give a you new, or refurbished, unit but that one will quit as well; they are actually quite predictable, between five and seven months of life span. If you are into self-flagellation by all means get yourself a couple of these!