I think their quiz features are very well done. You can have questions that depending on the answer, map to specific questions. You can also have leads imported into HubSpot based on their series of answers which can be very helpful for running multiple nurture campaigns. SnapApp recently added premade quizzes and are re-vamping their PDF uploader which is nice. Their customer service has been pretty good as well.
My company was intending to use SnapApp for product interactive mapping and making interactive assets, but it turns out that's not the case. A lot of the features they sold us on, were used in examples on their website, but weren't really a part of the SnapApp tool. These features were custom coding SnapApp clients did on their own. My marketing team doesn't have skill or time for that. Which leads to my next point: SnapApp is great if you have lots of premade content that can be uploaded, but if you don't, asset creation time doubles. My marketing team is small and we just simply don't have the time to create assets + recreate them in SnapApp. You can upload PDFs into SnapApp, but sometimes it breaks apart content and you have to do a lot of reformatting (for desktop AND mobile). But like I said earlier, SnapApp is revamping the uploadable PDFs, so hopefully that will be fixed. Finally, the product isn't super user-friendly (unless you pick a premade quiz template). Everything needs a lot of formatting and THERE IS NO BACK BUTTON!! I don't know who thought that leaving out a back button would be a good idea, but it's definitely not. It's annoying to be trying different design ideas and wasting immense amounts of time redoing pieces when a back or undo button would've quickly solved the problem. I have brought this up to SnapApp and they acknowledged it and commented that they get that a lot. To my knowledge, there's no plan to change that.