We currently do a lot of this stuff internally using our own system. But I must confess that we don't have great analytics on it...so it's tough to know if it's effective. Will check this out as an alternative.
Out of curiosity, how's this compare to using something like Intercom.io?
Definitely a common problem. Awesome to hear you have something setup though, that's a step ahead of most!
Tracking metrics properly would help you take it every further.
Intercom is (in my opinion) more closely related to a CRM. It's messaging features are quite powerful and give you the ability to do support and in-app messaging really easily.
In contrast, our focus is squarely on email right now. We make it easy to setup sophisticated campaigns, use custom HTML templates and do A/B testing - all the good stuff you'd expect when dealing with emails. On top of that we want to make it easier to send better campaigns by building out tools that really help you drive your conversions higher. Reporting is a big part of that, as is sharing real-world examples!
Out of curiosity, how's this compare to using something like Intercom.io?