You may find that things are not in the same place you left them, but all in all it's a much better piece of software. I'm afraid we can't go back to the old style as it was only a beta version. This version is an all around improvement, but I'm sure some liked the old colors better.
The style sets are much more labor intentive to create for this version because of the huge amount of added features. For now there is only the default colors. I may add at least one additional style set if there is sufficient demand.