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Interesting link ... even for just general info @ UPS diff vs. $$$ diff.
Too bad marketing people have to muck everything up with "smart" lingo that can turn Einstein into an ignoramus due to BS terminology. If it uses a sine wave converter, just say so, if it uses a step converter, just say that. BS @ back-ups vs. smart.
How is a guy without a scope supposed to tell the diff when everything is masked by marketing lingo? I'm pretty sure the store clerk isn't going to be versed in the diff ... "Oh, this one's better because it cost more and they put more stuff in it." ... I can hear it now.
Well, I guess the assumption is that you are plugging computers into them and the power supply in the computer will smooth out the power. They aren't expecting you to plug a studio flash into them but yeah, a sine wave should be a sine wave.
Even though the UPS units are half the cost of the vagabond, they are 3x the weight and size.