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 able get all info related his website needs without having much hassle.- You may also think why would anyone want such kinda software when they have their own custom code? Because your target audience isn't just tech savvy people who understand coding languages well enought o write codes themselves!! So make them aware of benefits like better conversion rates (higher than average), less bounce back etc via online ads before.