i use monster chinese v5.3 build 050414 for view chinese characters, Monster SIP v5.2 build 060315. i installed handwriting chinese simplified and traditional for writing chinese.
i have zero problem with it. these softwares were from my old WM5 O2 flame and they work seamlessly with WM6.
i disabled all the other input methods eg. the keyboard, transcriber and ... in the registry and just left with the monster sip. everything is working very well so far.
i think MS has made great improvements in terms of stability and compatibility in WM6 unlike Vista.
Samsung Galaxy Note since Feb 2012
Samsung Galaxy S2 since Feb 2011