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i just finished the portuguese duolingo tree.

they have a few bonus modules that you can do as well as some duolingo stories, which i'll play around with.

here are my thoughts on the program:

pros:

-it is probably the equivalent of 3-4 years of high school portuguese
-it will give you a good understanding of grammar
-makes learning portuguese funner (not fun, but funner)
-teaches you a lot of vocab

cons:

-it teaches you sentences that you are not applicable to real life
-it only teaches you basic portuguese.
-a computer program won't be able to help much with pronunciation

have some realistic expectations:

-at the end of the day, duolingo will only take you to about an A2 level.  duolingo is only a beginner tool.
-you will not have a good understanding of the imperative, subjunctive, or past participles.  Having said that, subjunctive and past participle grammar is advanced grammar.  in my experience, after studying spanish for 3 years in junior high, 4 years in high school, and several years on my own after college, i didn't know how to use the subjunctive in spanish.

will you be able to talk on the phone in portuguese after finishing duolingo portuguese: no

will you have conversational portuguese after finishing duolingo portuguese: no

will you be able to easily order at a restaurant in portuguese after finishing duolingo portuguese: probably not

is duolingo worth it?  yes.  it is a free program that is the equivalent, in my opinion, of 3-4 years of high school portuguese.  it will give you a strong background in basic grammar and a lot of vocabulary, but it is only the beginning.  it will give you a foundation, and then you have to seek out new tools to raise your portuguese level.

how to use duolingo:

-i can't stress this enough: only do each lesson once.  absolutely do NOT repeat lessons.  it is a waste of time, and will hold you back.  you have so much shit to cover when you learn a language.  you can't be reviewing the fucking basics for 2 years.  i know this from experience, as i've used duolingo for another language for awhile and kept repeating lessons, which ultimately made me waste almost 2 years.
-the desktop/website version of duolingo has grammar notes and also grammar discussions, which makes it superior to the app.  actually, i've never used the app, but i don't think the app has these grammar notes or discussions.
-in my opinion, the most important part of learning a language is speaking to others and having them correct you or give you tips.  however, i think it's also necessary to learn grammar from formal lessons or duolingo or from a textbook or website.  the grammar puts all the speech in a framework.
-if you're serious about learning another language, then duolingo can NOT be used as a standalone program.  it must be supplemented by other learning tools, whether that be through other websites, a textbook, watching movies in portuguese, taking a class, or having language partners.