Very impressed with the service. It does, however, seem like someone has the market cornered and is using that power to their advantage. Tread carefully and be sure to have an exit price plotted. Also, keep your eyes on the diff increase.
TL/DR: Be smart. Carelessness leads to coinlessness.
Disclosure: I have shares at cex.io
so true
we need to plan a security exit, it's easy to invest 10-20 BTC on this and mine cheerfully, but price is going to fall every day a bit more.
The guy who suggested Cex.Io warned me about this. Said to be ready to sell back.