I'm a strong supporter and a long-term user, forever in love with the brand, the mascot and the playful and hilarious tone of voice. I've been enjoying Duolingo's French course for about a year now and while I would (and have) highly recommend it, I've seen some drastic changes which pushed me away as a premium subscriber. I.g. I'm really missing audio lessons with Paul and Estel, and the learning "tree" instead of "path" which it used to be.
I'm still a user, though, and I'm still very excited about the product and the people behind it!
Decent as a crutch for learning languages, although you should also practice the languages outside of it. It can be unstable at times, although that seems to be improving in recent versions.
I adore Duolingo! I even feel as an ambassador because some of my friends also join studying after me.
What I like the most is that Duolingo constantly evolving their mechanics. So you won't be bored.
I'm with Duolingo since 2016, finished Italian course twice! And now I'm also have more that half of a thousand streak.
Duolingo helps me to be multilingual
My phone's language setting is in English, but I still want to learn English using Duolingo. However, the app doesn't allow me to select English learning options without changing the entire phone's language settings.