Sigma USA WILL NOT ACCEPT FOR WARRANTY! This is a great deal BUT do your home work and google all of the Sigma lens issues and you WILL NOT BUY! If this was a USA deal (NOT GREY MARKET) then go for it but with returning it back to get it serviced not worth it, in fact I think Sigma is like Tamron and once they see it's grey market they won't service it even if you pay for the repairs but call Sigma USA first.
I am not sure who told you the opposite.