I've used the Pre-Algebra and Algebra videos and have had great reviews from most of the kids. Personally, I like the real-world application, but Nye doesn't go into depth with concepts or practice. Overall, the videos are great for beginner Algebra students.

Daa'iyah Na'im
Director/Head of School
The AGVI Academy for Gifted Youth
http://AGVIgifted.org