Ask IH : Do you guys use these? Instapage,Designmodo,Sellfy,MDBootstrap,Kickresume or Tapfiliate

Hi Indiehackers,
I would like to know if any of you guys have used the above-mentioned products, for me, these seem expensive, to be honest, that is why I thought of building paybackhub.com it's a cashback platform, you guys are the first to visit. I have built this keeping in mind that the very problem I felt and hence cashbacks are high too.. If you can review the site/idea or just let me know if you have used any of those, it would be of great help. Thank you.