There's no denying the inaccuracies in the majority of benchmark tests, but the only one I want you to see is the FileSystem benchmarks. Not the cpu or gpu ones. FileSystem measures how fast the storage/memory on the phone is writable and readable. The Galaxy S phones have an issue where out the box all the apps are stored on an internal class 2 SD card, instead of the faster internal NAND memory causing severe lag and even stalls when transitioning between screens. That has been fixed through a hack though, which requires reformatting the file system and 1.5 GB of internal memory which the Epic doesn't have, making a fix impossible for the time being if indeed there is a lag/stall issue on the Epic 4G.
The benchmark for FileSystem, if accuratee, is a sigh of relief, cause it seems like there will be no lagging or stalling between transitions out the box with the Epic 4G. Let's hope This is the case, otherwise it will be a huge deal breaker. The Vibrant can take up to 10 seconds to get back to the home screen from an app when the home icon is pressed. That would really kill the experience if it's present in the Epic 4G and unable to be fixed due to low ROM.