I have been a couple of times to Green Forest. The place is nice, people very friendly, service is good and the food is great and fresh. Parmesan pork is amazing (just personal taste :) ). I have been to several other churrascarias (one in Brazil too) and I would say that it is really comparable. The only thing it might be room for improvement is to bring a larger variety of meats (to justify also the fairly high price compared to other places with larger variety).