for me it also is Hdri,bones,ik,fk,global illumination,the texture room the awesome spline modeler,non realistic renderer,pyhsics,tree modeler,text modeler,terrain editor,modifiers,import/export of many formats,the fast preview renderer,light special effects and many more stuff i like in carrara,this makes carrara a highend tool for me.it is very easy to use and you have good results in no time.much options for the money.what i also like is that there are so many great plugins for a fair price out there. i just used spatch 2 month ago,funny.:)