NRG-1 is either an extremely potent stimulant or complete bunk depending on which vendor you buy from and what they have lying around at the time, it seems. If you get the strong stuff then 10mg is a pretty hefty dose but it is nothing like meph - more like MDPV with varying levels of unpleasant side-effects even if you get a version without MDPV in.
"Pure" naphyrone has just started to show up some places and I would recommend that over NRG-1 as it's far cleaner and more enjoyable - unlike NRG-x it even has some euphoria

- but still nothing like meph. Meph is like meph. Nothing else is.