VTusa was one of the first to start the "pre odrder for hot up coming items" trend. Essentially like a group buy at a discount price. They are legit but with the nature of orders like that when a shipment gets delayed or held up at customs it can take a while and people loose their shit when they dont get it by the "estimated date" which is why so many group buys go south and people start doing charge backs when a shipment gets delayed by a couple of weeks.
I have not had any issues with them on stuff I have ordered just know that if its a pre order theres a chance you might be waiting so read carefully to make sure your doing a pre order or something they have in stock on any sites that do it.