I am using redbus since some 3 to 4 years and feels it is a very platform for ticket booking.
Earlier travellers had to rely on the cheating booking agents which is now almost gone especially for people who can use computers.
There are other competitiors of redbus but since the redbus site has less graphics and so it is faster. But problem is many times it does not shows up latest and refreshed data as compared to other sites.customer support is ok.