The rest of the iPad presentation editors
DataViz's $16.99 Documents to Go Premium is less than basic when it comes to presentation editing, allowing just text touchup.
The free-with-Google-account Quickoffice's presentation editor is basic, really aimed at touching up presentations and not creating new slideshows.
Infraware's Polaris Office 5 runs slowly when working with slideshows, and offers just basic capabilities.
Microsoft PowerPoint (requires an Office 365 subscription) is neither basic nor sophisticated, with sufficient features for editing and basic spreadsheet creation.
Artifex's $9.99 Smart Office 2 is unusable due to a very poor user interface and limited capabilities.