I love them because they creates class culture by having students work together with different people and I can quickly mix up the groups if I am not liking some dynamics and/or seeing imbalances with teams. I also have 85 minute classes, so I this a great way to break up that long time period.
I sometimes use these tech tools to quickly preview/introduce vocabulary for a story and/or a unit and students play with English to Spanish definitions. This is quick and easy. Here is an example set.
However, far more frequently, we play Quizlet Live and Gimkit with fill-ins and comprehension questions and this is a much more useful and CI focused way to use it. It is also much slower and students have to read and think a lot more!
A few people have asked about what the sets look like, so here are a couple of sets from Quizlet (I export these to Gimkit too). This one is to review the story "Un hombre un poco obsesionado" (to go along with the song "Ella"). These are some of the questions in the Quizlet set.
When I choose how to play, I choose the version on the right, which requires a subscription (worth it for me!):