This is like a small, humble version of the huge all-you-can-eat buffets found in larger cities like Taipei and Kaohsiung, albeit with fewer options, including no tea or coffee. At 200NT (lunch), it's a good deal for a good meal.
As usual at non-vegan restuaurants in Taiwan, when I told them I didn't eat dairy products a well-meaning staff member took me round and pointed out a few obvious dishes which contain dairy (like cheese pasta) but missed fake meat, mayonnaise dressing and even buttered bread! So vegans need to avoid anything which looks milky, regardless of whatever staff might say.
From my experience, this is the second best option in Hualien after the Loving Hut.
Cons: difficult to know what's vegan