Just as specifically mentioned right at the beginning, this movie is not simply an adaptation of the Tagore classic. This is hugely inspired and then intricately woven into a beautiful film by Rituparno Ghosh.
Similar to other movies by Ghosh, this one too is a very mature movie and may not get along well with everyone. The sheer complexity and at the same time the purity of human emotions have been portrayed magnificently through the four titular characters. On one side there is a picture of the prejudiced society entangled in it's rituals and customs and on other side there is a face of a rational society free from those burdens which are all tied together by the melancholy verses of Rabindra Sangeet.
In short one of the under rated cinematic brilliance of Mr Ghosh.