I have made lots of BTC here
i have never had a problem withdrawing winnings
you can register and deposit small amount then withdraw
it would have to be more than 0.011 BTC they charge a small fee to withdraw 0.001
and minimum deposit is 0.01 BTC to trade
to test but i have never had a problem withdrawing my winnings
if you know the oil maket its great
its better to trade with one BTC
you can easy make 0.3 BTC  a day with oil if you know the market