The idea of the product is good, but implementation is nowhere near where I would expect a market-ready product to be.
We've setup a couple of templates for testing purposes, and then launched one of them.
Not sure what happened, but all of our contacts received 4-6 emails within an hour timeframe.
Not only they received duplicates of current day email, they also received all previous ones multiple time... and all within an hour period.
What a disaster and embarrassment for us.
On top of that, now I have to deal with my domain being blacklisted for spam.
Just effin great!

Be careful when you use this tool - that's my only advise.