Do a forum search. People like DC rainmaker have weighed in on it here: He says that power graphs used to advertise the product show that the Xcadey power numbers are way off comparable power meters.

As long as it is consistent it doesn't matter.

His reluctance to review is somewhat odd
Does he get sponsored to review the other brands?

Nope, I don't get paid or sponsored by any brands to review anything.

But when I can look at a companies own marketing/sales site and the graphs they show are horrendously inaccurate, I'm simply not going to waste my time on it. I've got plenty of products in a long queue of things to review, all of which at least seem reputable, along with being things people ask for.

Said differently: If a company can't at least cherry pick the best possible data set to share, what's the other data sets look like?

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My tiny little slice of the internets: dcrainmaker.com