Is this trip worth it?

I was thinking about taking a coaster trip that would include:
1. Six Flags Great America
2. Big Cheif in Wisonconsin Dells
3. Mall of America
4. Valleyfair!
The only park that I have been to is SFGAm and I was wondering what people think about the other 3.

Haven't been to any of those, but I must say that #1 on my list of parks I have not been to in North America is Big Chief at Wisconson Dells. The coasters there are supposed to be great.

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Age and treachery will always overcome youth and skill.