I've turned over 100 acrylic pens in the last week, only 15 were Sierras so that is 185 half blanks. That is at least 50% more that I typically turn in a week, but not too unusual. One of them broke while turning. I suspect that I cracked it while drilling and I didn't notice until a big chunk flew off.
Every one of them was rounded off with a round nose scraper, including a lot of Inlace Acrylester. Most of them were turned down to near finished with the scraper, then finished off with a skew, quite a few of them were finished entirely with the scraper. On Inlace Acrylester I pick up the skew much sooner than on any other material.
Sharp tools and high speed are needed, but most important is technique. I turned a few thousand of them before I stopped tearing them up. Practice, practice, practice.