As others have mentioned the dock itself as a piece of hardware works as intended. The fact that you can very easily depress the volume keys by sliding the Epic into the dock is really a major design flaw, I'm not sure how they managed to let that one slip through, would've been simple to add a groove to the base that provided space for those buttons.
The second major issue I have with the dock is actually a software complaint rather than a hardware one and thus, in theory, more easily remedied. The home dock app seems pretty well thought out but I would like to see more customization ability. I come from the Blackberry world where I used my device as a clock in 'bedside' mode and by comparison the 'night' mode on the Epic dock app is much brighter. It's not really conducive to sleeping. I'd also like to see the ability to change text/background colors and to remove the various icons.