I'm a huge fan of BD's. I used to go out there more often back in my college days, but still make it out a few times a year.
Basically you get an empty bowl and walk down a buffet of fresh ingredients. The selection of meats, veggies, sauces, and spices is awesome. You pile it all into a bowl and then take it to the grill where the chefs cook everything up on the spot.
You can pretty much make whatever you want and then go back and make something totally different on your next trip. Spicy, sweet, seafood, beef, vegan....it's all there. Add the rice and tortillas and I'm not sure how you can go wrong.
The chefs used to really put on a show, but it's pretty boring these days. Coventry is a super hip little town to hang out in as well.