I personally know a handful of converts that came to Traditionalism (from other faiths) due to the Diamonds. All converts were men.
The Diamonds are a little nutty on some things, and I don't like their constant anathemas of heresy, but...in our overly feminized, wishy-washy, "maybe, sometimes" world, the Diamonds presentation of the Faith as "yes, yes and no, no" speaks to people, mostly men. It works. Can't argue with results.
I'm one of those converts. Someone had posted a link to their Steven Anderson docuмentary on 4chan, which is how I found out about them years ago. Even though I had an anti-Catholic bias during that time due to my Baptist Bible Belt upbringing, I still watched the video because Steven Anderson annoyed me (some people on 4chan would constantly shill for him, which sparked my annoyance). It was well worth it, because Peter Dimond was able to thoroughly dismantle Steven Anderson's wicked errors using the Bible alone. Every citation from scripture I double checked in my KJV, and sure enough it lined up. After that video, I became more interested in learning about traditional Catholicism. Eventually I moved on past them because there were some red flags in the back of my mind about them, but it took a while to move past them as I was slowly discerning truth in the sea of trad chaos. If I would have remained a dogmatic Dimondite, I would have never started attending Mass or properly learned the faith.
The value of the sacraments cannot be understated!!!It's just too bad that the Dimonds espouse some errors, because their orthodox material is some of the best online that I've found. Their apologetics against non-Catholics is very compelling, and their blunt delivery is refreshing in a world where people constantly beat around the bush.