Ignore the reviews that claim it's a shadow of the original M7, I had a bottle of M7 from the the year it was released way back when, a bottle of the "reformulation" when they made the bottle see through and the lastest M7 Absolu and they are all virtually identical, the dry down is 100% the same. Still as strong as it was originally.
Where did you order it from does Rio have it?
How does Rio manage their low prices, often a good R800-R1000 off from Foschini etc?
They are 100% legit, I've ordered from them but still amazes me.