I have had the gfx since it was released and I can tell you that it is a top notch charger. The futaba is just getting to everyone and it is a bit expensive if you ask me. I have a pro trak and a gfx and I love both. The pro trak to me is great it does a lot, for example it has single cell monitoring, it has temp charge capabilities, it has a discharge tray called the ICS (intensive care system), it can be hooked up to a computer and you can get graphs of your batteries performance, and it also has a motor run in mode with an optional stand.
The newer 30 amp version will be out and the ICS will be able to be hooked up to the charger and monitored, at this time with the 20 amp version the ics is a stand alone unit. If you haven't looked into the pro trak talk to crimson eagle, he's on the forum here and ask him questions he is the USA rep for Pro trak.
The cool thing about this charger it is upgradeable with ROM chips too.........
Danjoy25 made a comment about it being user friendly and he is right. I can tell you it takes some getting used to but it is well worth it.
Just a thought.......look into it and make a decision.....you can't go wrong with either charger they are all pretty good.
Crimson Eagle, correct any of my statement above if I explained something wrong.