Not sure, but it they seem to promote themselves alot in this forum. I'd test it out first with small amounts.
Also note that your not buying/selling physical coins, but some form of a future.
I understood the fact that I would'nt be buying physical coins. I will definitely test with small amounts (if I decide to test at all) but even then the leverage (and various fees) can hurt the wallet badly if not well understood, this is why i'm asking for some help and explanations.