Why not? As far as I understand, the first EE is a decent enough package, with all the needed bugfixes etc. Unless you like modding new content into your game, I don't know why you wouldn't play this version.
less than a minute ago Removed SupportsCDKeyCopyToClipboard – 1
less than a minute ago Removed ShowCDKeyOnLaunch – 1
less than a minute ago Removed LegacyKeyRegistryLocation – HKEY_CURRENT_USER\Software\Valve\TestApp8850\SteamKey
less than a minute ago Removed LegacyKeyRegistrationMethod – registry
If its live will make a new thread! Can't wait to play!