Rated 4 out of 5 stars
I love this... yes I found I had some of the issues the others are complaining about, but...
Glocal - The QuickFolders issue I've had with or without Mnehny installed. The tabs get spaced out across the toolbar. Usually this fixes when it updates.
Philemon_siclone - This is because you have it setup to show all headers. set it to normal and that will stop. When you need to see all of the headers set it back to all. I hardly need to look at all of them but it is nice to have them all setup to do so.
One thing it could use is the ability to setup some default layouts for the columns that can be selected for other mail accounts/folders. I setup all of my sent folders the same but have to do it in each of the 9 mail accounts. Letting me create a few defaults that I could select for the folders would be great.