Tactics: Woodpecker Method

A lot of people might have heard of the book Woodpecker Method, if you haven't it's basically a tactics book that you need to repeat 7 times, each time quicker and quicker. The ones that went through it, what is your experience with it? More importantly, do you see improvement in your actual play? 

I've just gone through the whole beginner and intermediate section after 99 hours (only the first cycle) and honestly it's the most difficult thing I've ever done in relation to chess. Did everyone find it as hard? I might have gone too deep prioritizing accuracy, but honestly the accuracy is not even that high, 93% for easy and 67% for intermediate and I wouldn't say I feel big improvement in my play. Would love to hear your thoughts.