Hi
I had the caprice package and chose the chocolate cake. It was fine as cakes go. It was the standard one included in the package and there was plenty for 18 people. I wouldn't upgrade though I don't think they are worth it. I think they will add rum if you ask.
We made up for it when we got back home at our reception, and had a 3 tier proper cake, bottom layer chocolate, second tier carrot cake and top tier fruit cake. It was shapped like 3 suitcases and was lovely!