I have MobileFiles Pro (which I'm refusing to update to Quicksheet) and am still going to wait and see what the DocsToGo app actually contains and whether they say Excel and Powerpoint editing will be included in future updates.
That's my only concern with quickoffice, if they come out with a powerpoint module, i have a feeling they will create a new app and call it quickoffice premium or something. but hopefully they learned their lesson and won't do that but i'm not holding my breath.