I haven't read this cover to cover, because I would rather dip in and out using the parts I need. The introduction already gave me a lot of insight into editing things yourself. By using this I've now done my first ever proper second draft! And I think the results turned out great, I definitely felt like I knew what I was doing by following Siler's advice. I learned a lot, too.
I'd definitely recommend this to anyone who wants to up their writing game and has never learnt to edit. A lot of the content also works as general writing tips because it goes into why things work and why they don't.
Can't wait to keep learning and improving using this!