I have been trading with GFT for 1 1/2 years now. The chart & order management functionality are by far the best i've come across.
This is balanced however by a platform which crashes periodically necessitating a full reinstall every couple of months, charts which freeze & of late very slow fills when using their direct deal tickets - fastest 3 seconds, slowest 10 seconds plus. They then only fill you if the price is in their favour (& no positive slipage) otherwise a requote. Getting any information out of them is like banging your head against a wall. Everyone in their dealing room tells you a different story.
The account managers are eager & efficient, however ultimately ineffectual as they are really trained only to open new accounts & handle the simplest of enquiry. Beyond that they refer you back to the dealers or IT in the US both of whom I find to be by & large obstructive & unhelpful.
I hope that helps !