The offline material I saw at their center was excellent. Prerna at Gurgaon center helped me go through the process of learning - basically demonstrated how each topic is assessed and trouble areas are taken care of. The ubuntu based offline system was impressive. Excellent stuff.
People generally provide reviews when they are pissed off. They assessed my child and provided me with the assessment and the areas my child needs to improve on. As a complementary gift they provided me with some tests - EVS and maths that would help in the upcoming Olympiads. I will definitely try one of their systems - online or offline one day.