ab machine?

Question:

i have a ab machine like these two
http://cgi.ebay.com.au/Original-Ab-Cruncher-Exercise-Machine_W0QQitemZ140013687292QQihZ004QQcategoryZ15274QQrdZ1QQcmdZViewItem#ebayphotohosting
http://cgi.ebay.com.au/Ab-Cruncher-Cheap-Good-Condition_W0QQitemZ150017075543QQihZ005QQcategoryZ15274QQrdZ1QQcmdZViewItem#ebayphotohosting
are wondering how good they are?
i haven't used it before but am keen to see if it will help tone up the abs.
what do you think? is it as good as crunches?

Answers:
That wouldn't be called a machine but.......

And if it is good? Yes is good, but on the range of 250 to 500 abs on a single try.

That only works the upper abs, but those are the ones that get noticed first by average people, so that is good.

Believe me, less than 250 is a lost of time.

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ab machine?

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