We often drive half way across Madison to get to Dhaba, and it is always worth it.
The food is excellent, with a lot of variety and flavor, delicious lassis and the nicest soft-spoken waiters. Every Sunday, rather than the usual Indian restaurant buffet, they serve thalis (a South Indian tradition of many small servings of meat or veggie dishes on a special steel plate, with rice, naan bread and dessert all for $9 or $10) a great deal, and we get a meal if leftovers out of it too.
Our son loves the dal soup and they let him have a big bowl without us asking.
Great personalized service and delicious food!