Pickles, can you share exactly what is in the collection there? I couldn't find it on the website which instructed me in the FAQ to buy a catalog to find out. This immediately made me wonder about the quality of the collection.
Bear in mind that maybe I am too focussed on the art itself -- there are many folks who like the Hakone Open Air art museum, for example, but I felt that the art collection (with the exception of the Henry Moore stuff, however I am not a big Moore fan) was definitely second-rate.