No, I was already over 2000 FIDE.
I would agree with kikvors' overall assessment of the contents : I was also more at home in the tactical chapters (though some of them are quite challenging anyway) and found the strategy chapters more difficult.
If you're not sure, you can also start with the blue books - there's a lot of interesting material there too.
Here are samples of medium (**) exercises in the first orange book :
the first puzzle, "puzzled" me. It was quite easy to spot the first move. A bit harder to find the second as there where 2 choises, the rest seems straight forward , but i did wrong because there is also an alternate checkmate:
I've been working on Build up your Chess 1 for a couple of months now and I'm seeing improvement OTB already. Not much mind you, but I found the first two chapters on Mating Motifs very difficult and after I'd worked through them I learned a lot of new patterns and attacks some of which I used in my games. I have a long way to go but I think Yusupov is honest about the level of calculation and analysis required to improving one's rating - too many players want 'GM in one week' type books that are unrealistic.