I have not used the North Fork bullets yet, but plan to do so this year and next.
I've got a DR on order and I've asked them to regulate with NF bullets.
After doing a lot of research, I chose them for several reasons:
1.) I've yet to see a negative comment about performance on game from someone who has used them, in fact most reports I've seen are glowing and almost boringly consistent. Boringly excellent performance is just what I want in a DG bullet.
2.) I am attracted to the fact that they offer 4 different designs in most bullet weights. For a regulated DR, this means you can have a.) a Semi Spitzer (SS) for larger PG and for initial shot on buffalo b.) a scored ogive rapidly expanding Power Point (PP) for a cat load or lighter PG c.) a Cup Point Solid (CPS) for backing shots on buffalo d.) a Flat Point Solid (FPS) with a very modern angled meplat design for elephant or any situation that calls for max penetration. All of this in the same bullet weight which hopefully will shoot to POI at reasonable ranges in a DR.
3.) The CPS may offer a reasonable compromise should you be hunting in a lead-restricted environment.
4.) Perhaps most importantly: they are usually AVAILABLE.
I think if NF would offer loaded ammunition they could make quite an impact in this niche of the market. Meanwhile you can hand load or engage a custom loading service.
At any rate, I'm looking forward to gaining some real world experience with them, and appreciate all those who have shared helpful reports.