I love Duolingo but.....
I love this site. I have been learning primarily Italian for several years now. But one thing I have to say is that when changes to the site take place or are about to take place Duolingo is terrible at informing it's users about anything upcoming. With that said, I still love the site and am very happy I am able to learn languages for free.
What i will say is this.. This is a free learning tool it cost you nothing , so if the developers change things and do it with little to no advanced warning , they can do that. Duolingo for what it is , is an amazing learning resource that i think some people take for granted.