Im using them too, they are rock solid. Only thing i would like to see is more liqudity/tighter spreads in USD/CNH. Its one of the few things that still move in FX, and interactive brokers beats them in this pair rather convincingly. Also more then 1 lp in index products would be good.
I'm still wondering if they will stop dealing with retail clients. There have been reports that they will, but apparently not so far.