Ok, well I can say that I have transferred about 50 sites using this plugin. There have been glitches, but overall it has saved me many many hours of manual work.
I had one site that just wouldn’t export. I spent quite a bit of time trying to get it to work, and finally contacted my host. They had some setting in place for security that was keeping me from doing the export. They changed it long enough for me to do the export and it worked nicely.
I did have to break one huge site down into multiple exports/imports, but that was ok, too.
And for everyone who is having problems with the images pointing to their old sites, there is a plugin to fix that! It’s called Import External Images, and can help in some cases. I also used a plugin called “seo transporter” (I think!) to move all my meta tags to the new format.