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Yes it's real, this has been happening for many years now, depending on the State you live in. As well, depending on where you live, the power company might buy back extra energy or give you credits.
Efficiency all depends on your average sunlight & your 'extra' power use, and less to do with the panels, now that they can magnify the light and capture more energy very easily, as well is bio produce it on the same panel, and way more depending on what you want to spend personally.
Most houses, under 3k sq feet only need a few panels, an extra panel or two will power a hot tub or heated pool, of course less light, more panels as well.
They also add instant value to your house.
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