I quite like duolingo. I don't dislike the hearts - makes me concentrate better sometimes. I don't mind the ads - if that means it's free. What I don't like is getting a 'free 3 day trial of super duo' from time to time. I don't mind it being offered to me but I should be able to politely decline. I have my learning strategy based on the free version. Having super duo foisted on me without my consent is bad enough. Telling me it's a free gift makes me very angry.
