The apps have a familiar interface, with the same Ribbon interface and layout. But at the same time, they're not just a port of the regular desktop version. Menus have been optimised for touch; objects can be dragged, rotated or resized with a swipe, and the interface scales properly in both portrait and landscape mode.
There's solid integration with other iPad features. You can use voice dictation to create a document, perhaps, or AirPlay to project your finished presentation.
You get plenty of functionality, too. This isn't the hobbled Office Mobile for iPhone: there are templates, tables, footnotes, filters, charts, transitions and just about everything else you'll need. Everything is very configurable, formatting is preserved so documents look just as you'd expect, and of course you can save and share your documents in OneDrive, OneDrive for Business and SharePoint.
If you're just looking for a viewer, then the good news is that the Office apps are free. Just download them and you'll be able to read and present documents, spreadsheets and presentations.
To create or edit documents, though, you'll need an Office 365 subscription. If you have one already, no problem; you're covered for all the apps installed on a single tablet in addition to your PC if you have an Office 365 Personal subscription ($6.99 a month) or on up to five different tablets alongside your five PCs or Macs if you have the Office 365 Home sub ($9.99).
What's new in Microsoft PowerPoint for iPad 1.1:
+ Presenter View: View and edit speaker notes, see your next slide, or jump to other slides while presenting.
+ Play Media: Play videos, sound effects, and background music while presenting.
+ Insert Video: Insert videos from your Camera Roll.
+ Picture Tools: Crop to focus on just the right part of the photo, or reset to undo your changes.
+ Presenter Tools: Now you can erase highlights and drawings on your presentation.
+ Send PDFs: Send PowerPoint files as PDFs.
+ Hyperlinks: Add links to your presentation or edit existing ones.
+ Fonts: Third-party fonts are now available in the Fonts menu.