I'm thrilled with my Epic's ability to play just about any codec/format I throw at it. I have several terrabytes of 720/1080 movies on my media server at home. No need to convert anything, just copy it over and it plays seamlessly on my Epic.
Now if I could just figure out a way to get movies that are larger than 4GB onto the SD card. With the SD card being FAT32 format, nothing over 4GB will copy. I have tons of 1080P movies that are 6.55GB and up that I would love to put on my Epic to watch. Looking for a way to get those to play on my Epic without converting which can be quite time consuming. I guess if I really need to put on of those larger movie files on the Epic, I could use DoubleTwist, but would really like to avoid that hassle if I can.