I agree with this many exchanger cannot be trusted my friend already send coin to other exchange but there is no coin receiving in her wallet, 
always take care when you send your coin to other exchanges.
always take care when you send your coin to other exchanges.It is not about trusting all the time, though trust is also something should be in mind but in most cases exchanges get hacked by evil users of internet, so that is why keeping all your coins in a exchange is not safe.
Thats why im not focusing on 1 exchange site because i i putted all my bitcoin on a site then suddenly been hacked then i got wrecked so bad compare to scattered all your bitcoin on some exchanges so that if one would be lost then you could easily recovered from the remaining investments.