We actually have accounts open with all of these exchanges. We have not had any problems with any of them yet, and we like the flexibility of being able to compare all the different prices on each exchange. Thanks for letting us know about Cryptopia, and as for C-Cex, it actually has some really wide spreads if you are patient, you can pick up many coins much cheaper than other exchanges.
RE: BitCoin and CryptoCurrency Trading Platforms You May Not Have Heard Of ...