Here is a good Woodworkers Journal web article on cutting logs for bowl turning.
While it is a reliable tool makes the job easier and does a good job on the safety and execution aspect of it, I think it falls short in placement, where to cut, which is one thing that many turners are confused about. I will have to dig up an article on that
You can check out their article here
CUTTING BOWL BLANKS WITH A CHAIN SAW
Written by Steve Worcester
Steve has been woodturning for 25+ years. He's demonstrated around the country, has articles in national publications and is passionate about the woodturning community. He lives with his wife and two dogs in Plano, TX.