I have the df64. It's definitely as solid as it looks. They've updated it a few times as people point out little annoyances. The main thing that still annoys me is a common feature on all of the fancy grinders: the chute has a gap between it and the collection cup. This lets chaff fly out and get everywhere, and you have to wipe it up periodically.
Idk why all of these companies keep building that way. I blame Niche.
There are definitely cheaper (but absolutely solid) pourover grinders, and cheaper (but still solid) espresso grinders, but there probably aren't many grinders at that price point that can swap back and forth with precision. I can do a pourover followed by an espresso and nail my shot timing every time. With really dark roasted beans (which I dont use unless I was gifted some), there can be a little bit of retention when switching between a pourover and an espresso (less than half a gram).