Have to disagree with the previous poster, you can try for yourself, but Good Reader is terrible for big files like the FCOM, it will glitch and crash.
The good news is that Ibooks is free and works 100% better for the big PDF files, it's slow to open, but once open it's quick and stable, it's also a good app for your PPS files, like the ones from Airbus.
I use Azul to play video files that I find on the web.
Cheers, D.L.