Kinda disagree on Never Split the Difference! Listened to the audiobook of it and found it to be a good primer on the basics of negotiation, something I profoundly lacked, was never taught, and had that used against me on more than one occasion.

Nothing mind-blowing, but for the price of free from my local library, I feel like the techniques gave me a little confidence in the process.

I do agree that a lot of these books could have easily been WAY shorter but try to sell you on value by page count lol.