The user interface of this tool was very simple to use, I really liked it! It has helped us improve our CTRs by increasing conversion rates from 20% in one month with another advertising network up until 10%. We have also been able not only increase revenue but reduce CPC as well which makes for less spend per impression (CPI). There are certain limitations that we've had trouble working around; however they were quickly addressed when brought forward so no issues there just more time spent trying figure them out than actually using their service :) If you're looking at improving your ROAS or CPM then look into Seventynine - definitely worth giving them try if all else fails!!