My Take
I use this very often to have students practice science terms and definitions, which is especially helpful with new terminology.
For a $25 annual fee, class progress, voice recording, and image uploading are options and would be useful for students at lower levels, just learning how to read.
Students enjoy the games.
How I Use It
Students create flash cards to study using a variety of techniques from self-testing, to racing other students toward mastery. Teachers can also create and share lists with students, and can password protect them. Tests can be created and printed. Flash cards may be grouped per unit, subject, or chapter.
This works great for my ELL students who can include the English version with their home language, and is very helpful for students learning other languages or terminology.