Really bad software, let me start:
1.) They have a very complicated pricing. You can see different coupon codes all around the web, but it is very easy to get a code for the wrong plan. So instead of quizzes you buy polls, or surveys or whatever.
2.) You CANNOT EXPORT your data. That's right. There is a feature to import your surveys / quizzes from excel to proprofs. But exporting is not implemented. So they want to make sure you are stuck with their $#*!ty software forever.
3.) If you happen to be a free user (because you bought the wrong paying plan because they are like 5 different plans for all their different products and you didnt buy the right plan) than all your users see A LOT OF ADS. I mean like 3 to 5 big ads on a single screen. And usually ADS FROM YOUR COMPETITORS. So the users / customers of your product are targeted by your competitors on a survey / poll / quiz you created.
4.) Probably I am very stupid (I am just a Software Developer) but I had a lot of problems navigating the software. I nevery knew how to get to my quizzes, to my settings, to my account, etc. In the end I saved 5 different links and navigated by the links I saved myself.
5.) I had a lot of formatting problems in designing my survey. Apparently you can customize the frontend of your survey. It is kinda a you-see-is-what-you-get editor. But in my case there were apparently some formatting saved from one of my previous versions, which i could not remove. So every text on the landing page on my quiz was in bold.
Please do me and human kind a big favor and don't use Proprofs...