It doesn't work well.. It works for some products and other don't and then it doesnt work for the products that it used to work but works for other. I do not recommend this app.
Did not work with currency conversions only in USD, then when uninstalled due to setting change it removed all product prices.
if you need i will check your issue and make it work for you.
Reason why you had hide prices after app uninstallation should be only because of your theme CSS.
I can check it for you too.