We've been very pleased with ezinedirector's service.
I have been searching for a replacement to send info throughout the month, but have been frustrated by the cost and the excessive options. We are pretty small. I only remembered this am that I had found ezinedirector, way back at the beginning. It worked great!!!
I think this is an excellent way to acquire paying customers AND will give many potential users the option to see if they can build a decent subscribership without having to front the $250 or more that would be needed for ListBuilder.