Does anyone have any experience with Jamison brass, now that they have been taken over by CapTech International?

Yes, they are still producing very nice quality brass.

I have used a fair amount of Jamison brass, both before and after the change to Captech, and I have been happy with all of it. Calibers have included .38-72, .40-60 and .45-60, as well as others I've probably forgotten.