I have used blue dart services for sending documents and parcel both. I have always had good experience with Blue dart. Once I was expecting a courier from them and I was not at home but @ a nearby place, the delivery came to that place to deliver the package. Delivery was punctual and the packing was properly done.
I just feel the charges are little high compare to other courier services. Otherwise Blue Dart services are good and safe too. I would suggest to use this service.