We chose to go with this app because it looked like what we needed and for a fraction of the cost compared to some of the other filter apps. Unfortunately we've had non-stop issues with the filter breaking our theme, so decided to uninstall it. However, the support team has been incredibly helpful and worked hard to try fix the problems.
The app does the job but deleting it has been nothing short of a nightmare. The customer service agent is pretty responsive and they helped fix the problems left behind by its code. I thought its fine now so lets go ahead an delete the app (I did not want to pay ~10$ for this) and voila! all the original problems are back.
Many apps that have a UI component like this one tend to cause malfunctions on the storefront. I would recommend this app only if you're sure that you can handle code fixes by yourself.
I tried to reach the customer service and wait for whole day but no one reply. If you change the product ratio you need them to help you to change. But no one reply.