Xpango scam or not?

[BuckBuck]

I received some emails containing referral ids to xpango. A lot of people are going crazy about it. Many other claim that they have received gifts from it. So what do you think it is a scam or not? I have an account but i am not using.

For those who do not know what xpango is, it is a site where they give you credits to complete offers. You can later convert the credits in gifts. The gifts are mobile, gaming and mp3 players. They consoles - XBOX 360 and PS3, a lot of mobile phones Nokia N series and Ipods. The offers DO REQUIRE credit card and investment. This is the thing that makes me think that they are legit...?