I spent 5 days there last fall and it is indeed a magnificent place. This estate property is owned and was developed by the Ferragamo family. It is a slice of Tuscan heaven.
The golf course is operated as a private club somewhat separate from the hotel and grounds. Weiskopf did a very nice job of fitting 18 holes into the beautiful valley landscape with a routing that falls on two sides of a saddle land form. While there are some good, if not very memorable holes on the front, the back nine presents better strategy and a higher number of quality holes. The course finishes much better and takes the land a wee bit better. The greens are mostly straightforward and a tad nondescript, but trying for much more might well have stuck out as oddly placed and contrived. It's most definitely walkable, but we never had any caddies and there are some lengthy connects between greens and tees.
Golf in Tuscany is mostly an afterthought and one should almost definitely try a round with a cart, if for no other reason than to have a place to carry a bottle of the local Brunello, some cheese and maybe a baguette.
PS..... The local head pro, staff and fellow members could not have been nicer and more friendly.