I lost trust in some of the speaker manufacturers. It happened when I was majorly ripped off in high school for a pair of JohnZer speakers. Let me say this though. Had it not been for that disappointment in my young life, I would probably have never looked into DIY for speakers. I have been at it for decades now, and am as equally fascinated by new/old designs, new products, and of course, the end result often being something to love. I don't own a set of speakers usually for more than a few years before 'what if' turns up, and off I go in another direction just to experience it.
The last two decades, I have ventured into electronics, and pretty much the same thing has happened, some of what I build turns out incredibly. And yah, sometimes it doesn't, and I learn from that too.
I wouldn't trade this experience for simply buying the latest new equipment off the shelf. Yes, I tried that a few times, but it can be a costly chance.