My Take
I honestly thought that there were better options out there. If you are looking for something that is just going to be flashcards, then this is the tool for you. If you want something more than just flashcards, like games that are a bit more enticing to students, this is definitely not a tool you want to try out. This might be better for college aged students who are more interested in learning than playing games while learning.
How I Use It
I used this to create flashcards for unit vocabulary. I struggled with getting the teacher account to work vs. the student account and ended up creating the flashcards as a student. It is geared more towards high school than it is elementary. Once you got the words in, it did work nicely to practice whatever you would have on the flashcards.