This 100 g offering, one of many from Lindt for Valentine's Day, contains dark chocolate, rather than the more popular milk chocolate products offered for that romantic day. I would say it just meets the criteria to call it dark, meaning more than 50% cacao content, its ingredient listing has sugar first, followed by cocoa mass, cocoa butter, milk ingredients, soya lecithin (as an emulsifier) and artificial flavour (likely vanillin).
How do they taste? If you like the smoothness of Lindt chocolate, especially of its dark chocolate version, then you will enjoy this chocolate. Well, perhaps you might be annoyed by the delay in having to unwrap each individual heart, but maybe that might prevent you from eating them all at one sitting.