My experience with their pre fits hasn't been the greatest, we ordered 3 barrels over the course of a year and ended up with 5 due to a couple errors on their part. 3 of the 5 barrels had messed up chambers from the outset, they did fix them in the end but it was still concerning that more than 50% of them left the factory with visible chamber issues.
One of the chambers was so rough it wouldn't clean up and needed to be reamed to a larger cartridge to fix. That barrel pressures out almost two whole grains lower and over 100 fps slower than other rifles we own in the same cartridge.
Which brings me to my second issue is that they all seem to be slow, over 100 fps slower than expected compared to other longer barrels in the same cartridges. I'm still working on loads for them but so far they have not been anywhere near as accurate or as easy to load for as my Proof Barrels.
I really do like the company and hope they get it together but at the moment I am done buying from them which is a bummer because at the moment they are one of the only ones offering Carbon Barrels over 30" and I really wanted to get a 30" 6.5 PRC barrel.