I think this is the best newsletter plugin for wordpress that I have tested.
But I have a litle problem with stats.
I've configured K-news in multisite installation with WP 3.4.2 and K-news version 1.2.5.
The problem is that sometimes in stats page the system loads the first graphic with subscription state but the other stats doesn't appear and there's a error message with the text:
"Has de sel·leccionar un rang de dates correcte"
Someone have this problem? Some solution for this?