Just went to Masalaa, the newly-opened South Indian Vegetarian restaurant in Billerica. I'm happy to report the food was good, though the heat level seems to have been toned down for American palates. Since I'm not a pepperhead, I found it all to be quite flavorful.
The menu is quite large and varied, with dosas and iddly and other S. Indian specialties, plus a wide range of familiar and less-familiar veggie dishes. Everything we tried was good. I really liked the Masala Dosa, Malai Kofta, and Paneer Tikka Masala (a good veggie substitute if you're craving Chicken Tikka Masala, a weakness of mine).
They seem to be trying for a somewhat upscale approach, with stainless steel water glasses, fancy metal serving dishes and plates, and even delivering the check in a nice wooden box. We paid $20 per person, which included a large assortment of appetizers, main courses, Mango Lassis, and after dinner Chai. I also tried the special ginger coffee, which is definitely an acquired taste, but should certainly cure any throat problems one might have.
Interestingly enough, it seems to be part of a small chain, or perhaps an extended family business. There are two locations in CO (Denver and Boulder), and one in New York -- how they ended up with a location in Billerica must be an interesting story. The CO restaurants have gotten good reviews on the Southwest board.
I'm glad there's finally a decent food option in the area, which is mostly a culinary wasteland. Hope they stay in business.