It probably has vast potential, but way too many commercial limitations for someone who's at least looking to make a halfway decent use of this on their sites at least with a testing of free version.
basically, if you think you can process these forms on SSL on your own wp setup, don't even bother downloading unless you want to fork over $25/month for SSL connection of bunch of calculators. They host the scripts on their site.
Just my opinion, but no calculator plugins should incur monthly charges..
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