The best thing about this software is that it does all of your email marketing for you, allowing you to have more time with what matters most - running our business! There are things I wish were easier or better organized (the template builder could be improved) but overall we're very happy customers so far.
We've seen an increase in sales from just using these tools alone; however, when combined they really make quite some difference. It's easy enough even a non-tech person can use them without any problem at first sight.