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I worked a lot with the sensors over this summer for a NASA internship, and while they were somewhat "jumpy" when they were on the verge of sensing something, they tended to be very reliable. Also, I think the jumpiness that I expririenced was probably germain to my project (tracking a contiously moving object through 3-dimensional space), and that the sensors would be very well suited for line tracking. I haven't actally made a line tracker though, so I can't tell you for sure.
Stephen
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