I currently have two. One is configured in handgun, the other, rifle. I've had quite a few barrels over the years as well. So, what would you like to know?
I can tell you up front that they will shoot under MOA, many under 1/2 MOA.
They do require a little different technique for bench shooting, but that just a learning process. They are excellent for most anything other than colony varmints or competitive benchrest shooting as the break open action creates a problem. I've used mine for deer hunting over the last several years in ML, 260 Rem and 5.6x50 RAI. They are light, quick and accurate...great combination.
Anything else?
Rick