So i finally had the opportunity to try Oga in Natick - and in general I would say my findings were consistent with this board's general opinion. The sushi was fine, the specialties were very good, the beauty of the place, and the lack of wait (at 8 on a Saturday) made it a good opportunity for those of you too picky to stay strong and wait for your space at Oishii : )
That being said, the fresh springroll with shrimp and squid was quite tasty, although there was a relish component to the dish that overpowered the seafood.
The Shumai with Uni "Carbonara Style" was delicous, two big plump shumai, more like a won-ton in my opinion, filled with shrimp and other seafood delight, sitting in a small pool of a creamy, uni enhanced sauce. Highly recommended.
Tempura as mediocre, too much batter, not light enough.
Oga Japanese style Clam Chowder was good, but next time I would stick to the Miso.
The sushi was of fairly good quality, not very large. he O-Toro was cut too thin, and was no where near the quality I am accustomed to at Oishii. Nice hamachi.
In general, the food is not near the quality of Oishi, but the size of the restaurant makes for a more relaxed dining experience. For me, though, I will continue to wait through rain or snow for Ting-san and his exceptional food.