Here's my take, having recently upgraded to C4 Pro from C3: 1] Having used other proggies, the interface on C4P is excellent, easy to learn and use after learning. 1a] The shader tree, the best of all other programs I've used. 2] Rendering. So many options, it's like christmas every time I render :D 3] New/Improved Animation tools. The morph shape addition and ablility to edit vertex models after putting bones into it is very welcome. Main reason why I upgraded. 3a] The attraction/magnet tool now has its own options in the properties tray, just like a real tool! 4] Stability. For me, I can use C4 for hours ( max time was for about 11 hrs) and no crashing or erratic behavior (except for Morph shapes, which as a new feature may require some time to iron out). 5] Parity in features/plug-ins between mac and windows. I cannot express how pleased it makes me to be able get "that neat plug-in" or "use that neat feature" on my chosen platform of choice. Things that chafe my hide: 1] When is the metaball modeling going to become actually useful? Basically it's still the RayDream plug-in "blobbies" (or whatever it was called) and is just as hard to use now as it was then in RD. 2] Not having a convient way to select shading domains other than going to the menu yadda yadda yadda. Now with morph target/shapes, being able to 'call up' previously saved selections would be a big ol' timesaver! 3] Having to 'recreate the wheel' every time I create a new character. this would include walk cycles, facial morphs and such. Morph targets I can understand, but why can't one just create a skeleton and put it in the object browser? It would be oh-so good to be able to save skeletions with all the constraints, IK chains, and motions intact (e.g. a walk cycle, hand wave and such) and apply it to a "virgin" vertex model like another program that claims to have Mastered Animation :> 4] Some easier way to make bones invisible/hidden. Currently if I want to work on placement of a hand's fingers, I have to manually hide all the other bones one-by-one. It would be really, really nice to be able to hide a parent bone and have the children of that bone also become hidden. 5] In the vertex modeler, not being able to lock verexes/polys. So if I'm modeling some tricky thing around another polymesh, I can lock one and then move vertexes around in the other. Like making an eyelid wrap around an eye. Instead of relying on the smallish preview in the property tray. The top things I would like to see in upcoming version(s): Like others, would like to see some softbody dynamics/cloth. IIRC, isn't there some kinda opensource 3D thingie that will do that? That would be so cool to have as a plug-in! Hair would be a fair addition to the Carrara tool set also. Translucency and Irridence would be just peachy to have as options in the shaders. Some kind of Constraint that would 'automagically' help with Follow through in animaiton. Something that would lag behind another bone/object by a user-defined amount. And a way to vary the "strength" of a constraint. This could allow for things like making jello shake or a spring spring.