Yusupov's book series

I have recently got

Boost your chess 2

Boost your chess 3

Chess Evolution 1

Chess Evolution 2

Chess Evolution 3

It's a lot of material and i think it will take me a long time to go through it. Have any of you studied any of these books and did it help you?

I think some reader comments can be seen at:

http://www.qualitychess.co.uk/ebooks/QandAwithArturYusupovQualityChessAugust2013.pdf

By the way, I think this is the approved reading order:

http://www.qualitychess.co.uk/ebooks/Build-up-Your-Chess-1-exceprt.pdf

http://www.qualitychess.co.uk/ebooks/Boost-Your-Chess-1-excerpt.pdf

http://www.qualitychess.co.uk/ebooks/Chess-Evolution-1-excerpt.pdf   *

https://www.qualitychess.co.uk/ebooks/Revision&Exam1-excerpt.pdf

http://www.qualitychess.co.uk/ebooks/Build-up-your-chess-2-excerpt.pdf

http://www.qualitychess.co.uk/ebooks/BoostYourChess2-excerpt.pdf    *

http://www.qualitychess.co.uk/ebooks/Chess_Evolution_2-excerpt.pdf    *

http://www.qualitychess.co.uk/ebooks/Build-up-Your-Chess-3-exceprt.pdf

http://www.qualitychess.co.uk/ebooks/BoostYourChess3.pdf    *

http://www.qualitychess.co.uk/ebooks/Chess_Evolution_3-excerpt.pdf    *

Think there are other threads on chess com about them too. Personally think they are great, and much more accessible than the Dvorstky ones, which sometimes seem to be designed to be unnecessarily complicated to me. 

I was reading Build up your Chess 2 chapter 1:Attacking the King and I was able to do the 1 star ones and some rare 2 star positions. But it greatly increases your pattern recognition.