I live around the area so I consistently order take-out; as such, this rating applies solely to their take-out menu.
Ambiance of India has always provided tasty food, quickly on-demand. Every time I order, it has been ready within 20 minutes. Their service is courteous and attentive - they are always eager to chat with the guy who is picking up the take-out food.
Everything I have tried on their menu has been good so far but I am especially a fan of their Mixed Vegetable entree and their Daal Makhani. The garlic naan bread is a must. They make it fresh and it never disappoints. If you have a chance, go to their glass-enclosed kitchen and take a peak at the naan-making process. It's pretty cool and the chefs are willing to explain it to you.
Tasty food and good service.