I bought the upgrade, downloaded it and have to echo the same as LCBoliou...Carrara 5 Pro, so far, is the best upgrade ever for this product. As for the comment "and the new interface is almost a piece of art!" ..."almost" would be the key word here. I still dislike the navigation tools. That darn zoom, pan, etc... are not as fluid to use as the ones in other apps like C4D or LW. If they would just change that I would really be a happy camper. Ok I said my peace. Off now to enjoy C5.