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I know several people that have them and are very pleased with them...
That said, they don't have 6-packs. If you have $100 (at places like dicks/academy) to spend on an ab machine, go for it. If not, swiss balls work too and they're cheaper.
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oh and gecko that link did not contain answers only the search page - swiftness_02
crossfit, the Apple/mac of the fitness world... T-Mac
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