$100 for a Cidly 6 reminds me of "too good to be true." Could be legit. If you have $100 to gamble with, give it a try. You might find a decent light for others.
The Mars is 5w. If I were going to get one I'd get it directly from TopLED (factory outlet for LG). They have good owner sentiment and a forum at another site where a rep participates (more likely to get problems resolved.). I doubt he's reselling. He's probably cloning the design and using the same name. That is questionable and gives me more doubt about the value of the first light.