I'm a fan of Danny. Yes, he criticizes things he thinks are wrong. He has decades designing speakers and crossovers. He has mostly been behind the scenes working for other brands. He champions DIY as a means to achieve high performance with minimized cost.
The folks that say he is a "salesman" need to understand the time and energy he spends with these upgrades. Yes, he sells upgrade "kits" to folks that want to improve the performance of their speakers, but he doesn't select the speakers to upgrade. Dissatisfied owners do. He does the design work for free, and is only compensated for his time with the profit he makes on these kits. How much do you think his time was worth upgrading these Wilson's? He knows what makes a speaker sound good. He also knows how to identify design choices that make for compromised sound. He sells very modestly priced speaker kits that punch way above their price point. I built the NX-Tremes. They are sublime. Incredible at the price point, and I had fun building them. Win-win.
Don't bash Danny until you look at his entire body of work. He is a huge asset to the DIY community.