How to eat at BD's:
1) Fill up your bowl with ingredients from the self-serve area, which includes meats, tofu, noodles, vegetables, eggs, etc
2) Choose your sauces and seasonings (lots of options)
3) Watch the cooks grill your food
I like BD's because you can potentially fill up your bowl with a ton of food and take home any leftovers. For the standard price ($14) you are limited to one bowl, and this is what I usually order (as a student you get a discount on Wednesdays that comes to $10). If you fill up your bowl enough you can stretch the leftovers to last several meals.
For a little more ($2 more I think) you can eat buffet-style although this means you cannot take home any leftovers.
All in all, BD's is worth checking out at least once.