I quite liked it myself (heck Haru slowly turning into a catgirl is rather cute, hahaha) although it is a short movie at just over an hour (74mins with end credits)
I've seen the majority of the Studio Ghibli collection but only own Howl's Moving Castle (the limited edition thinpack with all that cool art, i scanned a couple pics in a while ago) and The Cat Returns
I want to see Tales from Earthsea as well, which is being released pretty soon