It's great to see a national chain like this offer up vegan food. I tried PF Chang's a few days ago while on vacation. I had the veggie gyoza (panfried), veggie lettuce wraps, veggie springrolls(fried), and the coconut curry vegetables.
The gyoza were the best part of the meal. The lettuce wraps were good, but had too much soy sauce in the glaze which made everything too salty -- and I love salt. The springrolls were fine, nothing too special. The coconut curry vegetables was okay. The sauce was flavorful but seemed to be missing something. The tofu was flavored nicely, but the texture was not good at all. There were plenty of nice looking veggies in the dish, which is a definite plus.
Overall, the food is subpar to any actual Asian restaurant. However, when away from home and unsure or too lazy to argue with local Asian restaurants about fish sauce, this is an excellent cheap and convenient option.