Cultural training on India - Recomendations needed (Mumbai)

I'm considering 4 companies for cultural training on India (listed in alphabetical order):

Communicaid
CultureWise
Suray Consulting
Writer Relocations

Has anyone used their services? Can you give any recommendations?
Two first ones seem to be UK based or international ones, the two last ones seem to be Indian companies.
As the training is not cheap I want to get the best possible one.

Thanks, Kimmo