PBmining's drawback for me is the reason I don't use it. That's also why I use cex.io, but that's another story.
what did you mean with drawback mate?cex.io is worse i think, their price is expensive and their fee is crazy
The drawback is I can't actively trade and withdraw, which I prefer. I use cex.io for the trading profits.
that's why pbmining use contract system, they don't support trading
trade in cex.io not profitable anymore since they use fee for trade