I've been here twice, once four years ago and once this past August (2004). I enjoyed it quite a bit both times. The food is creative and interesting, with a greater variety of flavors and spices than can be found in many Taiwanese vegetarian restaurants.
On my most recent visit, I had the "Ma Po Curry", a curry-flavored Ma Po Tofu dish. It was quite tasty.
The service was excellent, with many water refills. I also really enjoy the interior of the restaurant. It's almost all wood, and it's very relaxing, especially in contrast to the mostly concrete city of Taipei.