Credits burn through at a great rate of knots
I actually quite liked what I saw when testing this app for a lower level SEO tool. However you burn through the credits so quickly there is no point using it.
I initially was given 300 credits (I signed up for 4,000 - there seems to be an ongoing issue where when you sign up it puts you at 300), and within 10 minutes of doing a check for around four key words, and checking a couple of other things, including refreshing my screen as the download button wasn't working I'd burnt through 185 credits (25 credits per keyword search).
So 4,000 credits at 25 credits per search is 160 key words/actions that you get. If you take into account mistakes, checking keywords that you pretty much know are no suitable but want to do a bit of a check anyway, accidental things you do, refreshing screen, trouble shooting if something isn't working etc... you will burn through this very quickly. I'd be lucky to get one project done a month on even tier 3.
There also doesn't appear to be any way to save research you've done for one client. You have to download the csv file each time to keep results.
Shame as it had potential.