Quote from AAAintheBeltway:
I have one major problem with these fx shops. They strongly imply you are trading the actual interbank FX market, but that is simply not true. You are trading a submarket they are making. It's kind of like betting on games, only you are dependent on the bookie to learn the scores. I have no idea how much they are off the actual interbank market, but how could you trade with them without this data? Of course they are happy to give you "free" quotes, because they are not market data at all but rather their dealing price. Is there even one of them who provides an actual interbank feed?