I've been there. It was an amazing experience.
It is difficult to find a good place to learn yoga. You know it's only a month and a half, and it is a lot of knowledge. But this school is a truely good one.
A big Russian influence make a really good and organized teaching programm (you don"t find this everywhere in India! ^^).
Class are very clear (even for those who don't have a very good english ;-)). Planning is intense but the time is nicely use.
Teachers there are passionate and make you love yoga more than when you start ( I didn't thought that was possible :-)) But not only.
You can't change a lot in that time (even with a strong mind) but after this course you have a knew comprehension about Yoga, about you, about the life around you...
At the end you are really proud of what you did and very happy<>/em to have this knew knowledge in your life. It is hard to find the right words.
And you will meet people from all parts of the world loving Yoga, India, and travel like you! A lot of good vibes from all people I met there.
Have a nice trip :-)!