Beside Tether issues - which I never used - I think that Crypsty is great. I am from Los Angeles, like Tether, and attended one of their presentation.
I made two attempts of withdrawal my USDs with Tether and they fail. After a full month waiting with my money blocked in that withdrawal attempt, the only answer I get from support is for ask me patience...
Is not a serious bussiness. They can nor freeze my money for a month, without any compensation or explanation.
After a month, they release my money, try again a withdrawal and fail again... I ended buying BTCs si I can get my money out.