If they fix the problems with it, this could be a 5 star product.
What are the issues you have been having with the extension ? Note that this is a little more complicated to configure than your average newsletter system & also understand how it works..I suggest you post on the community forums to get your issues solved as we have several users who are using it without an issue.
1. Latest Ads module with purchase of component
2. Not integrated with JomSocial/CommunityBuilder
If you don't care too much about either of those then I highly recommend this script.