Sharekhan providing its services since 17 years with 1.6 million customers and I know its service for 5 years. It is a well known and growing broker as a full service broker.
Product and Services - It provides Equities, MFs, ETFs, F&O, IPOs at one place.
Platforms - It provides online as well as offline trading and back office services
Research - provides quality fundamental and technical research compare to other full service brokers. It gives various tools and charts for manual research.
Cost - cost wise this is better compare to other full service brokers but not less than discount brokers.
Promptness - Research wise this is the best and accurate. It provides all services at fast.
Deciding Factor - Cost is only factor for selecting this broker compare to discount broker.