Hi I did the spirit of India in March this year. It was the most amazing experience. I didn't do the add on but others did and said it was great too. Be prepared for lots of travelling you are covering a large area. I found it all part of the adventure but others did complain about the early mornings.
The Taj Mahal was incredible at sunrise. We got to see a tiger up close at the Rathembore park.
The Ganges was again like nowhere on earth.
If you want to ask me anything then fire away. Otherwise enjoy, it is a fabulous place and I loved every minute of it.