I use it at work for PPTs all the time. I use either GoodReader or the Apple version of power point "KeyNote".
With the Apple App, you can drop it from any computer into iCloud and it will sync. Or within an email, tap and hold, then "Open With" either GoodReader or Keynote and it will open and save.
I like GoodReader, because then I can save pictures, .ppt, videos, .pdf, etc.