I Like the New Blogger
I should point out that I have only the one blog under this identity, so there were no complexities like those Devilinabluedress experienced. And I have no other contributors to manage, either. But before I moved forward with the switch, I did the following:
First of all, I backed up the text portions and embedded links to all my posts before switching over.
Second, I made a back-up copy of my template with its links, etc.
The advantages of the new Blogger are:
1.) Simplicity. I can manage my posts more easily. Since I have 30+ posts in the queue, I like being able to view my posts by "draft" or "published."
2.) Detail. I have some older posts that I probably won't ever publish, but I keep them around anyway. The new Blogger lets me label them as "Pending" without my having to look at them and say "is this the one I don't want to put up?"
The new postings publish almost instantaneously, none of that delay while it kicked in-- or having to choose between re-pub of the whole thing or just the index.
Never did figure out which choice to make, so would just vary it.
I also experienced some lost posts when Blogger would freeze during re-publishing, so that's no longer a problem.
Your mileage may vary, but if you aren't complicated, then maybe you will have as easy a time as I did.