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I don't have custom Neil Jones dies but I have custom made die sets now for 4 of my custom rifles.
Here are some advantages to custom dies honed to your fired brass/chamber.
Minimum sizing will cause your brass to last much longer than otherwise.
Custom dies will be cut true and concentric and will contribute to better accuracy.
Neck sizing only for 3-4 firings and than having to full length size again to bump the shoulder will be a thing of the past.
Also at $175 they are not much more than a set of Redding,RCBS BR dies.
Years ago before Redding offerd interchangeable bushing dies, I had Niel Jones modify a Redding die to accept neck bushings. It works very well and have been using it for 15 years or so. I also have a Niel Jones powder measure. This is a very well made tool. It throws extruded very accuratly. Im not sure but it probably has a min capacity of 5-10 grains and a max of 60-70 grains.