I don't have the Spark Chart for Marketing and didn't use it in my study for that exam. They are very helpful. Like ShotoJuku said, compact and you can study anywhere. I've found them very handy for a quick lookup of certain terms or overview. In general, I don't think they should be used as your sole source of study.

Personally I found the Marketing CLEP very passable with IC's materials alone.

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Ana
96 credits completed (93 by exam)
BS in General Business, Excelsior College (33 credits remaining)
Next exams: DSST Statistics, DSST Business Law 2
Recently taken: DSST Drug/Alcohol (61), CLEP French (63), ECE Gerontology (B ), DSST MIS (65), DSST Counseling (54), DSST Ethics (63)