>The merge module ships with VFP7. So.. If you later decided to upgrade to a full version of InstallShield all you need to do is copy that module to the proper location and you're ready to go.

Like it was outlined before, both VSI and ISExpress create installs for the Windows Installer engine. Last I check, they could also use the exact same Merge Modules. The only thing Install Shield is selling is teh interface, for the most part.