It's ok if you only do VAT deduction and your sales strategy is ok with having different total price for every EU member state. So, If you run EU wide advertising (for example finalprice on product X is 19.99 across EU states) then this app will not work as it will require the shopify option "calculate tyxes based on customer location" to be enabled. And that makes it impossible to have the same price with VAT, as it will always be calculated based on the price without your store's location VAT and then VAT will be added on top for every market in OSS system. So 19.99 will be 21.30 or 17.56 in some coutnries... After reply from support this is not a feature they'd care about.
Unfortunately merchant doesn't understand the Shopify tax system and chose to vent his frustration on our app.
Second time they installed Exemptify, apparently after looking for an app that can do what can't be done.
EDIT 30/05/2018: Developer has changed the text with our prices, which now means the text is all squashed.
Waiting for a reply from them to fix this back to how it was....
The two prices (inc & ex VAT) flashes up then disappears, so doesn't work for us.
Shame as we only wanted it to show both prices, not for all the VAT ID features.
Price text on collections if far too big too and overlaps so looks awful on our site
Had to uninstall after no-one on live chat and no response to email :(