Disclaimer: this is the only vegetarian restaurant I have been to so far in Chengdu. I have been here twice and both times the food was very good. The seating is comfortable and the mood is relaxed; on the other hand, the music sometimes veers toward muzak, which is annoying. The menu is extensive, featuring all kinds of fake meat dishes and vegetable dishes, and prices range from 8 yuan to 60+ (I think the most expensive dish is vegetarian abalone).
My first time here I ordered a spicy "beef" and black bean dish, and the second time I had "fish" (with seaweed for skin!) and mushrooms in spicy oil. These were actually two of the spiciest dishes I have had in Sichuan, and both were very tasty.
At the front of the restaurant there is also a little shop selling vegan groceries, including a selection of fake meats.