Benefits to US: 1) isolating India's commercial and military reactors; India's nuclear program will become more transparent 2) Selling reactors to India 3) Getting India into NSG; this will help non-proliferation Advamtages to India: 1) Strategic partnership with US and West; sending a clear message to China
Disadvantages to India: 1) Cant conduct nuclear test easily;
However, a future government can conduct Pokhran-III and quickly sign CTBT; this will allow India to continue its program; in any case France and Russia are openly supporting India; US will not be blind and dumb to lose the Indian market to France and Russia.