i don't think go cash is not useful , only Rs 50 can be used at that time of booking of ticket for Rs 600 , competitor are giving still better offer ,
Search results for "dear i am laxman kumar my booking to bangalore to goa date for 08/01/2016 but i am going to date 09/01/2016 so my booking dare is exschange"
I agree, this GoCash is not at all useful. Worst. That too valid only for 180 days it seems. This is one of the most worst idea.
Completely disappointed with goibibo GoCash......