I have had an account with ATC for about 2 years.
I am in the US. To me the best in the US.
They are basically a white label/IB of FXCM.
Your account (funds) is held by FXCM.
Your liquidity comes from FXCM. Your spreads are the same as the new FXCM raw spreads.
I have kept an account with ATC...