I have recently flown into India for my first visit in 15 years, I am cycling this time, having ridden there last time and my first observation from what little I have seen is how much cleaner the air is. I have yet to see a lorry or bus with a smoky exhaust and my hotel manager tells me they have an emmision test now, not sure that I believe him but there is evidence of some change.
I think it is the most dangerous country to motorcycle in, more so cycling, worse than Cairo and Saigon, it does require 200% concentration and it would be better for groups not to try to stick together.
My advice to new comers would be take a few days on foot or hired cycle to watch how the locals behave and stick by their rules, don't try to enforce what you are used to or expect, take it steady and give way to everything. Limit daily mileage to 200 or 300 km, it is a great country to visit and you will not forget the experience.