I did a lot of research before deciding on this product. Most whole house suppressors are single stage and either protect against LARGE surges while allowing small surges through or protect against only smaller surges. Even a small power surge can damage sensitive electronics, and a large power surge can damage everything, so neither option is really viable. This Siemens suppressor has three states and should work against all large and small overvoltages. It also has indicator lights so you know it's still working. Worth it, Spend a little more for extra peace of mind. Note that if you really don't know what you're doing, you should hire an electrician to do the installation. This takes about 1 hour of work plus the cost of a circuit breaker to suit your fuse box.
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