The implementation of the notification ad with an opt-in model has been surprisingly good... so far!
The Classical Music app generated the highest revenue from Leadbolt for the past 24hours! Talk about awesomeness!!!
So far no negative reviews or ratings. Will see how it goes from here...
PS - Leadbolt has also released their Icon Ad format. I've helped them beta test the library with Basic4Android, and it is a very simple integration and code implementation to get it to work. They wrapper should be out anytime now.