Cheap food and drinks. Portions are huge. You can find there a bit of everything. We had some Thai dishes and it was pretty good. I definitely recommend it.
They have good variety of food and good price for good food. The place is hot in the summer though and be careful with the cockroaches in the rainy season!
It's ok for food.The plus side it's cheap,but be prepared to get annoyed by street vendors. That's my only problem with eating outside on Bui Vien. I had a chicken burger and fries for 48k.