The best part of doppeler was that I could easily track my customers' open rate statistics so as not lose any potential leads or sales by sending emails with low CTRs- which in turn means lower ROI for me! There are lot's more features you can use but those mentioned above were what i liked most about it - easeofuse & easy tracking stats using google analytics.
Nothing really comes out negatively from this tool if one understands how Google Analytics works then he/she will definitely be ableβ¦