I use C6 without transposer, making only stills. If you use transposer, you can set up everything (lights, dynamics) as you are used to in poser and then render it with the superior C6. However, you can set up everything in C6 without any use of poser whatever. The lighting and scene options are far beyond the limitations of poser.
The disadvantage is learning a new software...
The poser content loads into a C6 scene by drag and drop and behaves much like you would expect within poser.
I only use poser these days as a sort of wardrobe department for my C6 scenes.