First, you have to keep in mind that, even though I rate this four stars instead of five, it is the best consumer product of its type on the market. The most important standardized metric for protection of electronic equipment is the clamping voltage. Peak let-through voltage is very important and related, but I have not found a standard by UL or IEEE for that metric. The clamping voltage of this item is 400 Volts. Ideally, you would like to have a surge suppressor with a clamping voltage of 330 Volts; but after looking pretty exhaustively for several months, I have been unable to find ANY surge suppressor for consumers rated for 330 Volts. I mean ANY...!!!! You will look at the package and say, "Where is the clamping voltage SHOWN?" Well, it AIN'T shown anywhere on the package or the Amazon listing! I could not find ANY manufacturer that listed the clamping voltage on its packaging or advertisements. "Why is that," you say. Well, there is some type of collusion within and by the manufacturers to not let you know what the clamping voltage is. Why? I'm not sure. Certainly, 998 people out of 1,000 don't know what it is, and wouldn't care if they DID know. People (and yes, I'm included) are just generally not very bright. You can probably find surge suppressors rated with a 330 Volt clamping voltage once you start getting into the hundreds of dollars for a surge suppressor, but how many of us can afford that? Especially because, if you buy a voltage suppressor that actually works, you will have to buy a new one every two or three years, because the little voltage spikes you get due to relatively normal power outages and lightning events cumulatively degrade the protection you get from a suppressor. And if you have a suppressor that actually PROTECTS your equipment, once it reaches the total capacity of the suppressor to protect, it opens the electrical circuit so that your equipment won't be damaged by a strike/spike. I.e., your equipment won't have power until you replace a real suppressor. If you have a "suppressor" connected and working for more than four years, I promise you it is not actually protecting your equipment. It is allowing the current/voltage through to your device with NO SURGE PROTECTION AT ALL. Yes, it's pretty well planned to hoodwink 99.9% or so of the population. If you know an electrical/electronics engineer, ask 'em. Again, you have no real alternative. There use to be a Rosewill surge protector listed on Amazon that is virtually identical to the Belkin, but I see now there is a message saying "We don't know when or if this item will be back in stock." If anyone does find a surge suppressor with a clamping voltage of 330 volts, I hope you will leave a note replying to this review, if you can. I won't check it often, but I probably will the next time my surge protector dies from the cumulative spikes I described above. Another reason I only gave this product four stars has to do with the rotating receptacles. I find that the spacing is too narrow to allow me to actually plug a hard drive adapter into adjacent receptacles. The adapter/plug is too wide. So I can only plug in a maximum of six devices that have the adapters (which are larger than standard plugs). As a matter of fact, I can't even plug in another STANDARD plug adjacent to an adapter, because the adapter body actually is so wide that it won't allow most standard plugs to fit next to it. Belkin needs to put another 1/4 inch or so between the rotating receptacles to make all of the receptacles usable. I just shake my head that some manufacturer can't make at least THIS feature usable. You would think a competitor would take the opportunity to make a buck by manufacturing one that actually does what this product is advertised to do.
