I never used manufacturers manuals until about 5 years ago. Airbus FCOM is an abortion in the paper or PDF form. The "Airbus laptop" version is OK as you can input a single MSN and get only that MSN. FCOM alone is 4-5 books on the 320 in paper format. Boeing uses one, of the same size.
I still haven't used a straight Boeing Flight Manual, but my company just started using a straight Boeing QRH. Absolutely brilliant. I get an amber light, and within 5-6 seconds, I am on the correct page of the QRH every time. It is the best manual I have ever used in 25 years.
This is not Airbus vs Boeing. I have flown both, a lot. I like both. Both have their strengths and weaknesses.
Airbus FCOM is a huge weakness. A tablet version where you can input a single MSN would go a long way towards fixing this problem.