No one legit investments company offer double profit in short times, and I believe that only ponzi scheme. Legit investment company only possible to offer not more than 1% a month. So be carefull with that site. If you want to make double profit is much better jump in to trading because you have more possibility to earn double profit consistently.
I'm not sure if that is a good gauge to say that a company is legit or not, there's one investment site good on right now but other high rank members see it as a ponzi eventhough its offering small percentage of returns.
As for the OP, I checked his profile and it seems his promoting this exchange so I wouldn't be surprised by the claims his been posting lately. As as what you guys have said, better to stay safe than sorry. So research before you put your hard earn money.