This integrates seamlessly with my Genoo Email Marketing Automation system, and I could not be happier with it. Easy to use, remarkably flexible, and completely responsive to anything I've set up within my Genoo system. Yes, only Genoo users will use this. My question for you is this: if you're not using Genoo, why not? You're missing out on the best value and most flexible platform for the money.
Disclosure: I do NOT work for Genoo, and they aren't paying me to write this. :-) I just think their platform is amazing!