If you make a change to a Poser file that you have imported previously into Carrara by Transposer, Carra will not automatically detect the change.   There is a means of updating the imported file, but I can't claim I'd swear by it.   "Swear at it" would probably be more accurate.   If the scene is quite complex, the update process may hit a memory problem, after which you will probably find that, rather than adding your change to the scene, Carrara has actually deleted, or moved, something that was in the scene already.   As it stands, the Native Import function seems almost completely pointless.

V5I was disastrously unreliable for me when it first came out, crashing on start-up, but that was fixed in the first service release and it has been fine since then,  more reliable than earlier Vues and much better at preventing disasters when trouble does arise.   There is said to be a trade-off of image quality for function in V5I, i.e. the price of those ecosystems etc is slightly inferior render quality, compared to basic V5.   I still think V5I is the one to go for and there is a very good product called SkinVue, which works (I think) only with V5I.

Carra is not bad at scenery, except that its terrain editor is utterly bonkers.   Vue is much more usable.