My Take
I love this tool and plan to continue to use it in the classroom. The main limitation is that the questions must be multiple choice.
How I Use It
Plickers is a student response system based in multiple choice. I use this tool as a quick way to assess how my students have absorbed the content, to assess and access their knowledge of a subject, and to poll them about a topic.
I really enjoy how rapidly I can gather responses and add questions. Students don't need to log into anything which saves time.
ALL students get to share their answers which allows you as a teacher to get the pulse of even the quietest student.
It's very versatile, all you need is your phone or tablet (and internet connection) and the cards. I had my students stick their card in the back of their notebook and I was able to use plickers in the park to test my classes knowledge of tree species, I just created the questions as I went.