Have you tried it with PowerPoint files yet.
I have stopped messing with using PPT files on iPad a long while back, and have used GoodReader as my presentation app before 2Screens. I have a lot of graphics from various sources, and import from PPT was never flawless.
When I have done building my presentation in PPT, I saved the original copy and then Save-As while selecting .pdf file type. Then a simple WiFi transfer to 2Screens.
I use minimal animation, more like controling apperance of text paragraphs to keep audience from reading ahead. IMHO, flying text /etc just too distracting for my type of audience. Thus, I don't mind losing the animation with .pdf and just make multiple slide copies.
What 2Screen has over GoodReader as a presentor app are:
- slides preview and allow slide jumping, if needed
- "pseudo laser"
- multiple presentations open at once, and allow jump between them
- easy to draw on slides
- ability to take notes while presenting
- connect with iPhone for control
I have asked the developer for the iPhone version, and the reply was he has one but not happy with the resolution. But when the HDMI cable comes out, he will release if quality improves -- then I will always have my presentations with me.
There is an iPhone presentor app called "PDF Presenter for iPhone 4" if someone wants to try and gives feed-back.