We like Art Reed. While not overly entertaining, he is brief & to the point. My kids like being able to see the person who is teaching them. I've thought about switching to Teaching Textbooks just because they can view all the answers...as DD moves to Advanced Math this year, thought it might be helpful (since I'm concerned this may be a little harder for me). However, I like that Reed uses his own sample problems, & he makes the work send easy.