Flash is very portable and stable, and has a good Object-oriented language behind it (Actionscript 3.0). I would be the first one to mess up with their UI add-ons =D

Well... I wouldn't say that Flash is stable with Crystal Tools, but I guess that with the new Graphics Engine (maybe called "Luminous"?) it'll be supporting it for the best. (right now in my PC if I set the shadows at Highest and play a Flash video on Firefox, the game lags whenever somebody has the Well Fed status, teleport or take supports)