Integration for the most part has been pretty smooth--I like that if you have a Google+ account and a Blogger account, it is fairly simple to integrate and feed your new blog posts to your Google+.
But what isn't so easy is integrating co-authored blogs into Google+.
Thanks to a tip from HubSpot, I found a bit of a work-around by setting up a Google+ author tag. But I'm not completely confident it will work. Plus, I had to do something that I was completely loathe to do--submit my Gmail account to the public domain. Ugh.
Why does Google insist upon getting all up into my business?