I've had one in .17 rem and one in .17/204. The .17 rem was on an AR and was probably the most accurate rifle I've owned. The .17/204 was on a custom Stiller bolt action and had vertical stringing issues and I never did get it to shoot. I think heat plays a huge factor with these. Some say carbon will dissipate heat faster, but I didn't experience that with mine. The .17/204 held heat really bad and I think that in combination with the thin profile barrel underneath caused the vertical stringing problem. In rimfire, it would be a great option. In centerfire, I would only do it again in a big game rifle or something like that where only one or two shots would be taken at a time. My barrels were both Shilen match, but weren't the high dollar Christiansen ones, but I would think they would be similar in performance since carbon is carbon and the other variable would be epoxy, which wouldn't have much effect on cooling. That said, I could shoot 30-50 rounds in the .17 rem without much of a break before it got hot. Very similar to the .204 stainless bull barrel I also had at the time.