I’ve been publishing a series of articles called What The Pros Use that shares data about the rifle...
precisionrifleblog.com
I compete in PRS and I am shooting a lot of rounds through a PRS rifle. I started with a Joe Walls custom rifle (Impact 737 action) with one of his 6 Dasher Krieger prefits (shot great), replaced with a Proof Competition Contour in 6 Dasher (shoots great, going strong 1500+ rounds), and there is another new in box Proof Competition Contour 6 Dasher in my shop when Proof #1 goes or hits 2500 rounds.
I have used prefits on my Tikkas and my older "non prefit capable" Stiller Spectre I use a barrel nut ReMage barrel.
Prefits perform for me, are cheaper, and faster turnaround vs gunsmith (in my experience).
Proof keeps its prices down by offering a limited selection of contours, lengths, calibers - I am fine with that as I appreciate the cost savings. There are other shops that offer a wider selection of prefits or you can go to a gunsmith and get a full "custom" experience.