I have mixed with both. And I can say the Prime pre’s do sound amazing. The test I did had me swapping it with dlive pre’s (same as DX4816 from what I understand). All the musicians even commented they liked it better. Now all this is totally subjective.
I would say it’s only worth it if your entire signal chain will justify it. Putting that great signal into a bad PA or low end in-ears probably wont result in a transformative experience.
Mixing with them was much easier to me. Transients just hit that much better. Imaging is that much more clear. And that better input just made the whole chain feel like it had to work less. But no doubt that comes at a cost.
Jason