One time use discount codes is not included at $9.99/month it is in an upgrade to $19.99/month - this should be stated in the description
Interesting but not worth the effort!
I ran the trial for a few days but got no results. The reporting interface is extremely slow and always shows no views, even though I have tested it several times so there should have been at least those views. The coupon reminder that appears at the top of the web page covers my top menu and logo. It would be better if it loaded above the top of the page, not over it. I gave this 3 stars because I only trialled for a few days so maybe it would have yielded some results over a longer time, but the other issues were enough for me to try another service instead.