Although the setup is a bit more intense than others, the page analysis it gives for blogs is the best I've seen. Have used a few others and separate sitemaps and this clearly does the best sitemaps.
Contrary to the post above I am switching from my previous one to this. It even provides a way to import data from the others installed, so don't delete those first.
I've just been using it for the past week, so don't know the results yet for search engines, though has to be better than what I've been using because the results for my website have been less than satisfactory and using this plugin has pointed out some areas for correction.