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OT: (because this topic really doesn't have much to do with Best Buy's sale tactics :-):

JeanDavid,

That was basically the point I was trying to make. Line interactive units are what most people use (due to popularity of the brand as well as initial cost considerations) in their home and small business setups. If an application is critical, the double conversion class is frequently a better choice. Imagine if your blown power supply had been part of a medical life support system or a military command/control setup.

We practice all this backup and redundancy stuff to protect against rare but expensive/dangerous/inconvenient events and the costs are in the same class as modulating the size and type of insurance coverage.

You pay your money and take your choice.

Jeff
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